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Using field as comment.
On any compute of my RDO Juno DVR deployment I am able to run.
Are you able to reproduce the same on yours ?

[root@ip-192-169-142-147 neutron]# ip netns
fip-76a8cbc3-ebed-4502-9448-a3f25b028886
qrouter-2ba3a798-5964-4ea7-87ed-d8e171afaf23
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 ip a | grep "inet"
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
    inet 169.254.31.29/31 scope global fpr-2ba3a798-5
    inet6 fe80::b0d0:2dff:febe:76d/64 scope link 
    inet 192.169.142.154/24 brd 192.169.142.255 scope global fg-ba2f2344-8f
    inet6 fe80::f816:3eff:fe82:f091/64 scope link 
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.169.142.1   0.0.0.0         UG    0      0        0 fg-ba2f2344-8f
169.254.31.28   0.0.0.0         255.255.255.254 U     0      0        0 fpr-2ba3a798-5
192.169.142.0   0.0.0.0         255.255.255.0   U     0      0        0 fg-ba2f2344-8f
192.169.142.153 169.254.31.28   255.255.255.255 UGH   0      0        0 fpr-2ba3a798-5
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 ifconfig
fg-ba2f2344-8f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.169.142.154  netmask 255.255.255.0  broadcast 192.169.142.255
        inet6 fe80::f816:3eff:fe82:f091  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:82:f0:91  txqueuelen 0  (Ethernet)
        RX packets 774365  bytes 1050468192 (1001.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 335056  bytes 26893163 (25.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fpr-2ba3a798-5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.31.29  netmask 255.255.255.254  broadcast 0.0.0.0
        inet6 fe80::b0d0:2dff:febe:76d  prefixlen 64  scopeid 0x20<link>
        ether b2:d0:2d:be:07:6d  txqueuelen 1000  (Ethernet)
        RX packets 334991  bytes 26890433 (25.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 774307  bytes 1050465960 (1001.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Using field as comment.
On any compute node of my RDO Juno DVR deployment I am able to run.
Are you able to reproduce the same on yours ?

[root@ip-192-169-142-147 neutron]# ip netns
fip-76a8cbc3-ebed-4502-9448-a3f25b028886
qrouter-2ba3a798-5964-4ea7-87ed-d8e171afaf23
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 ip a | grep "inet"
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
    inet 169.254.31.29/31 scope global fpr-2ba3a798-5
    inet6 fe80::b0d0:2dff:febe:76d/64 scope link 
    inet 192.169.142.154/24 brd 192.169.142.255 scope global fg-ba2f2344-8f
    inet6 fe80::f816:3eff:fe82:f091/64 scope link 
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.169.142.1   0.0.0.0         UG    0      0        0 fg-ba2f2344-8f
169.254.31.28   0.0.0.0         255.255.255.254 U     0      0        0 fpr-2ba3a798-5
192.169.142.0   0.0.0.0         255.255.255.0   U     0      0        0 fg-ba2f2344-8f
192.169.142.153 169.254.31.28   255.255.255.255 UGH   0      0        0 fpr-2ba3a798-5
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 ifconfig
fg-ba2f2344-8f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.169.142.154  netmask 255.255.255.0  broadcast 192.169.142.255
        inet6 fe80::f816:3eff:fe82:f091  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:82:f0:91  txqueuelen 0  (Ethernet)
        RX packets 774365  bytes 1050468192 (1001.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 335056  bytes 26893163 (25.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fpr-2ba3a798-5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.31.29  netmask 255.255.255.254  broadcast 0.0.0.0
        inet6 fe80::b0d0:2dff:febe:76d  prefixlen 64  scopeid 0x20<link>
        ether b2:d0:2d:be:07:6d  txqueuelen 1000  (Ethernet)
        RX packets 334991  bytes 26890433 (25.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 774307  bytes 1050465960 (1001.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Regarding multiple external network see Comment 6 from https://bugzilla.redhat.com/show_bug.cgi?id=1054857#c6

Using field as comment. UPDATE 12/25/2015
See Running DVR with Two external network via flat network provider on CentOS 7.2 RDO Liberty
END UPDATE

On any compute node of my RDO Juno DVR deployment I am able to run.
Are you able to reproduce the same on yours ?

[root@ip-192-169-142-147 neutron]# ip netns
fip-76a8cbc3-ebed-4502-9448-a3f25b028886
qrouter-2ba3a798-5964-4ea7-87ed-d8e171afaf23
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 ip a | grep "inet"
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
    inet 169.254.31.29/31 scope global fpr-2ba3a798-5
    inet6 fe80::b0d0:2dff:febe:76d/64 scope link 
    inet 192.169.142.154/24 brd 192.169.142.255 scope global fg-ba2f2344-8f
    inet6 fe80::f816:3eff:fe82:f091/64 scope link 
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.169.142.1   0.0.0.0         UG    0      0        0 fg-ba2f2344-8f
169.254.31.28   0.0.0.0         255.255.255.254 U     0      0        0 fpr-2ba3a798-5
192.169.142.0   0.0.0.0         255.255.255.0   U     0      0        0 fg-ba2f2344-8f
192.169.142.153 169.254.31.28   255.255.255.255 UGH   0      0        0 fpr-2ba3a798-5
[root@ip-192-169-142-147 neutron]# ip netns exec fip-76a8cbc3-ebed-4502-9448-a3f25b028886 ifconfig
fg-ba2f2344-8f: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.169.142.154  netmask 255.255.255.0  broadcast 192.169.142.255
        inet6 fe80::f816:3eff:fe82:f091  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:82:f0:91  txqueuelen 0  (Ethernet)
        RX packets 774365  bytes 1050468192 (1001.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 335056  bytes 26893163 (25.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

fpr-2ba3a798-5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 169.254.31.29  netmask 255.255.255.254  broadcast 0.0.0.0
        inet6 fe80::b0d0:2dff:febe:76d  prefixlen 64  scopeid 0x20<link>
        ether b2:d0:2d:be:07:6d  txqueuelen 1000  (Ethernet)
        RX packets 334991  bytes 26890433 (25.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 774307  bytes 1050465960 (1001.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Regarding multiple external network see Comment 6 from https://bugzilla.redhat.com/show_bug.cgi?id=1054857#c6