Updates to params.pp for mongo and postgres packages

*) Removed the hardcoded postgres package from db.pp
*) Changed the mongo package to python-pymongo for RHEL

Change-Id: Ib975f9ce03ee8ffa423e75b62b595bcdefdd1eed
Signed-off-by: Francesco Vollero <fvollero@redhat.com>
(cherry picked from commit 0fb3b8f693ba4cc24bdcfb1f61de843343a13e75)
Alarm: record history support

Ceilometer Alarm is able to record alarm change events.
This patch add this support in manifest.

Change-Id: Id8ece03dfd3491cd2886a345771df9622d702190
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
(cherry picked from commit 24a712516bb721bd62ead06cabadc631b8b7f060)
changed rabbit_virtualhost(wrong) to rabbit_virtual_host

the puppet module configures a rabbit_virtualhost, there is a missing underscore (rabbit_virtual_host). changed this for manifest and tests.

Change-Id: I02b34eb6531cfa0071a7e52f5a97f0e952f8ea85
(cherry picked from commit bfece45c001de44b727b0b2441db25fc9b45024c)
Merge "Alarm: record history support" into stable/havana
Merge "Updates to params.pp for mongo and postgres packages" into stable/havana