Do not enforce glance_control_exchange

The default glance_control_exchange in Ceilometer has been changed
from 'glance_notifications' to 'glance' in grizzly-2. Glance always
had 'glance' for its control_exchange.

This was a bug in Ceilometer and puppet-ceilometer patched it.
It shouldn't anymore.

Change-Id: I217515c91f092fb3e8039dde2d14a7ab4cbb7245
Closes-bug: #1273878
Define $user referenced in db.pp

In db.pp, in the exec 'ceilometer dbsync' ressource the user
is supposed to be $::ceilometer::params::user, but it was
not defined.

Change-Id: I812b6ba2877faddfce86d3c97b95772b0d22d368
Merge "Do not enforce glance_control_exchange"