Add facts for host pacemaker properties

This exposes some pacemaker property information through facter.
There are two main types.

(1) For each cluster member, a fact named pcs_props_<member name>,
which is a comma-separated string similar to the output of "pcs
property show".

(2) For each cluster service, a fact named pcs_setup_<service name>,
which is a boolean indicating whether that service is present on *all*
cluster members.
Merge pull request #357 from jeckersb/facter-pcs

Add facts for host pacemaker properties