Kolla Bug causes ironic inspector to not start

Issue

• upon installation, openstack-ironic-inspector.service is in the failed state
• systemctl status openstack-ironic-inspector.service

● openstack-ironic-inspector.service - Hardware introspection service for OpenStack Ironic
   Loaded: loaded (/usr/lib/systemd/system/openstack-ironic-inspector.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2017-04-10 09:53:51 BST; 14min ago
 Main PID: 10909 (code=exited, status=1/FAILURE)

Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector     _iptables('-N', CHAIN)
Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector   File "/usr/lib/python2.7/site-packages/ironic_inspector/firewall.py", line 45, in _iptables
Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector     subprocess.check_output(cmd, **kwargs)
Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector   File "/usr/lib64/python2.7/subprocess.py", line 575, in check_output
Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector     raise CalledProcessError(retcode, cmd, output=output)
Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector CalledProcessError: Command '('sudo', 'ironic-inspector-rootwrap', '/etc/ironic-inspector/rootwrap.conf', 'iptables', '-w', '-N', 'ironic-inspector')' returned non-zero exit status 1
Apr 10 09:53:51 machine0.bb2.vbu.int..com ironic-inspector[10909]: 2017-04-10 09:53:51.220 10909 ERROR ironic_inspector
Apr 10 09:53:51 machine0.bb2.vbu.int..com systemd[1]: openstack-ironic-inspector.service: main process exited, code=exited, status=1/FAILURE
Apr 10 09:53:51 machine0.bb2.vbu.int..com systemd[1]: Unit openstack-ironic-inspector.service entered failed state.
Apr 10 09:53:51 machine0.bb2.vbu.int..com systemd[1]: openstack-ironic-inspector.service failed.
[stack@machine0 ~]$