Ensure Cinder uses the VIP when contacting Glance

Updates cinder.conf so that it will set glance_host and glance_port
with data from heat template.

Change-Id: I2b6aebf782b0825b4a980b22763e04dc79593efa
Closes-Bug: 1351110
Merge "Ensure Cinder uses the VIP when contacting Glance"