Add package support to ceilometer-alarm-notifier

Updates the ceilometer-alarm-notifier so that it supports
using distro packages via pkg-map and package-installs.
The default distro package is set to openstack-ceilometer-alarm
which on RHEL/Fedora contains the ceilometer-alarm-notifier
binary.

Also, includes the related svc-map configs so that the
packaged version of the systemd scripts work correctly.

Change-Id: I0f40e0e241d3cfa2f2c33164a871792fe1b0bee2
Merge "Add package support to ceilometer-alarm-notifier"