Jenkins slave puppetry for CentOS.

The install scripts now look for CentOS in release files. Also some
instances of facter's operatingsystem are switched to osfamily and
capitalization of RedHat is normalized to match what facter uses.

Change-Id: I3bbca5481d0d5e6de9e62bfd6e2b0a85264ed6ed
Reviewed-on: https://review.openstack.org/27398
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins
The facter osfamily of Ubuntu is Debian.

Clean up facter osfamily matches to just use Debian, not Ubuntu.
This is manually tested and confirmed to at least be the case on
Oneiric, Precise and Quantal.

Change-Id: I27b184ac419910f9c3271c3b4e57886333282a5f
Reviewed-on: https://review.openstack.org/27399
Reviewed-by: Spencer Krum <krum.spencer@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins
Use facter's osfamily instead of operatingsystem.

The osfamily fact is more flexible when we want to support more
GNU/Linux distributions while avoiding unnecessary code duplication.

Change-Id: Iea4c73c19e7f94df8daccf25c764b6a4539a1ea0
Reviewed-on: https://review.openstack.org/27400
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins