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It seems it is related to the way you insert the values in nova.conf file.

Add the first interface (int1) in nova.conf
restart nova 
create a VM that uses that interface [here VM NIC 1 is mapped to int1]
delete the VM
add up in nova.conf file the second one (int2)
restart nova
create a VM that uses those interfaces [here VM NIC 1 is mapped to int2 and VM NIC 2 is mapped to int1]
delete the VM
add up in nova.conf file the third one (int3)
restart nova
create a VM that uses those interfaces [here VM NIC 1 is mapped to int3, VM NIC 2 is mapped to int2 and VM NIC 3 is mapped to int1]