Use versionless keystone endpoint for barbican-related configurations
Use versionless keystone endpoint for barbican-related configurations

castellan (the key manager interface used by nova and cinder) is no
longer tied to keystone v3 [1]. So now it's possible to use versionless
endpoints for keystone.

[1] I124c0ea2d9403d6b530b33f18896c4e7bf4eabb5

Change-Id: Id5d893a6a41077ab76ca59295593a27be5c3004c

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates