BZ #1103915 - Ordering issue during deploying neutron-controller on RHEL7.

https://bugzilla.redhat.com/show_bug.cgi?id=1103915

Notifications config was being attempted by puppet before the neutron packages
were installed.
Merge pull request #247 from jguiditta/icehouse_neutron_ordering

BZ #1103915 - Ordering issue during deploying neutron-controller on RHEL...