pmdahacluster: Update help text for status metrics
pmdahacluster: Update help text for status metrics

Update the help text for the hacluster.pacemaker.nodes.status.* and
hacluster.pacemaker.resources.status.* metrics to better reflect their
meanings and make these metrics more understandable for end users.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp