cat /etc/fedora-release 
Fedora release 21 (Twenty One)
[fedora@asathe-fedora21 ~]$ rpm -qf /usr/bin/packstack
openstack-packstack-2015.1-0.11.dev1616.g5526c38.fc23.noarch
[fedora@asathe-fedora21 ~]$ hostname
asathe-fedora21.os1.phx2.redhat.com
[fedora@asathe-fedora21 ~]$ ping -c1 `hostname`
PING asathe-fedora21.os1.phx2.redhat.com (172.16.157.7) 56(84) bytes of data.
64 bytes from asathe-fedora21.os1.phx2.redhat.com (172.16.157.7): icmp_seq=1 ttl=64 time=0.020 ms

--- asathe-fedora21.os1.phx2.redhat.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.020/0.020/0.020/0.000 ms
[fedora@asathe-fedora21 ~]$

selinux is in permissive mode. packstack --allinone reports error during setup of ssh keys.

Setting up ssh keys                               [ ERROR ]

ERROR : Failed to run remote script, stdout:

openstack-setup.log is as follows:

<snip>
chmod 400 ~/.ssh/authorized_keys
restorecon -r ~/.ssh
2015-10-15 12:51:26::ERROR::run_setup::1018::root:: Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 993, in main
    single_step_aio_install(options, logFile)
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 761, in single_step_aio_install
    single_step_install(options, logFile)
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 792, in single_step_install
    _main(options, answerfilepath, logFile)
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 655, in _main
    runSequences()
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 626, in runSequences
    controller.runAllSequences()
  File "/usr/lib/python2.7/site-packages/packstack/installer/setup_controller.py", line 81, in runAllSequences
    sequence.run(config=self.CONF, messages=self.MESSAGES)
  File "/usr/lib/python2.7/site-packages/packstack/installer/core/sequences.py", line 109, in run
    step.run(config=config, messages=messages)
  File "/usr/lib/python2.7/site-packages/packstack/installer/core/sequences.py", line 50, in run
    self.function(config, messages)
  File "/usr/lib/python2.7/site-packages/packstack/plugins/prescript_000.py", line 1198, in install_keys
    install_keys_on_host(hostname, sshkeydata)
  File "/usr/lib/python2.7/site-packages/packstack/plugins/prescript_000.py", line 1182, in install_keys_on_host
    server.execute()
  File "/usr/lib/python2.7/site-packages/packstack/installer/utils/shell.py", line 128, in execute
    raise ScriptRuntimeError(msg, stdout=out, stderr=err)
ScriptRuntimeError: Failed to run remote script, stdout: 
stderr: Warning: Permanently added '172.16.157.7' (ECDSA) to the list of known hosts.
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
</snip>

I've created passwordless login for fedora user for this host and able to successfully login.