Use internalURL for ceilometer-agent-compute

Compute nodes cannot reach public VIP w/o
br-ex mappings configured. In order to allow
ceilometer compute agent to communicate with
API endpoints, use internalURL.

Closes-bug: #1388745

Change-Id: Id32f551ffb79f8e32660cee7b167176c800ac54d
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Use internalURL for ceilometer-agent-compute" into stable/5.1