Remove PKI support

2016-12-28 05:50:50.135 4927 WARNING oslo_config.cfg [-] Option "signing_dir" from group "keystone_authtoken" is deprecated for removal. Its value may be silently ignored in the future.
2016-12-28 05:50:50.136 4927 WARNING oslo_config.cfg [-] Option "revocation_cache_time" from group "keystone_authtoken" is deprecated for removal. Its value may be silently ignored in the future.
2016-12-28 05:50:50.136 4927 WARNING oslo_config.cfg [-] Option "check_revocations_for_cached" from group "keystone_authtoken" is deprecated for removal. Its value may be silently ignored in the future.

PKI token support has been deprecated in the M release and will be removed in the O release.

The following repositories are part of the OSA deliverable, we should remove PKI support from these repositories:

openstack-ansible-os_aodh
openstack-ansible-os_barbican
openstack-ansible-os_ceilometer
openstack-ansible-os_cloudkitty
openstack-ansible-os_cinder
openstack-ansible-os_designate
openstack-ansible-os_glance
openstack-ansible-os_gnocchi
openstack-ansible-os_heat
openstack-ansible-os_ironic
openstack-ansible-os_magnum
openstack-ansible-os_monasca
openstack-ansible-os_neutron
openstack-ansible-os_nova
openstack-ansible-os_sahara
openstack-ansible-os_watcher
openstack-ansible-os_trove