Centos support for ceilometer

Centos support for ceilometer packages.  Tested on Centos 6.3

Requires [1] for firestack (or changing default branch [2]) and [3] for ceilometer package

[1] https://github.com/dprince/firestack/pull/40
[2] https://github.com/redhat-openstack/openstack-python-heatclient/issues/1
[3]https://github.com/redhat-openstack/openstack-ceilometer/pull/2