Ensure nova-common is installed before ceilometer

Ceilometer depends on the nova user and group being
present. This change adds a dependency to nova-common
to ensure that packging will handle the user before
the ceilometer compute agent tries to add user ceilometer
to the nova group.

Fixes bug 1350980

(cherry picked from commit 08fc9d9159cd9eb0830d550abb1058bc2b9b5759)

Conflicts:
	spec/classes/ceilometer_agent_compute_spec.rb

Change-Id: I26dd4e8e4172d777a04d99c7d23c1861714ca079
Merge "Ensure nova-common is installed before ceilometer" into stable/icehouse