Install necessary packages for ML2

In case of multihost instalations mechanism packages might not be installed
(agent might be installed on different host). In this case we have to install
appropriate plugins.

Change-Id: I62aab85378c6f3d6bb4bd53e3ac49c64106d6e3a
Update ceilometer module

Submodule update required to pull in the:

Class ceilometer::agent::compute fails when there are [DEFAULT] sections
commented. This patch is fixing this issue. For more info check
https://bugzilla.redhat.com/show_bug.cgi?id=1060712

Change-Id: I027066881bd6ff3bda61b7cd41336c771d330ebc
Merge "Install necessary packages for ML2"
Merge "Update ceilometer module"