Added missing pki volume for custom CA.
Added missing pki volume for custom CA.

Some services want the CA to be in the anchors directory. Just mount it
everywhere.

Change-Id: I5cf028d9424a253f8b5d66d818a091508b9486d7
Closes-Bug: #1766178

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