Add package support to ceilometer-alarm-evaluator

Updates the ceilometer-alarm-evaluator 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-evaluator
binary.

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

Change-Id: Ie7c68ddd6d17de4b48b7ef9eb692ee650e38c601
Merge "Add package support to ceilometer-alarm-evaluator"