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.
Reviewed-by: Clark Boylan <firstname.lastname@example.org>
Reviewed-by: James E. Blair <email@example.com>
Approved: Jeremy Stanley <firstname.lastname@example.org>
Reviewed-by: Jeremy Stanley <email@example.com>