Add glance config for barbican
Add glance config for barbican

Configure glance to use barbican as a key manager
when barbican is enabled for image signing.

Change-Id: I2cad0b81eeab07785dfd4bb66e582d359504b0aa

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