Help descriptions added for DNode stats, all metrics are counters, so no changes in pmda.c.
Help descriptions added for DNode stats, all metrics are counters, so no changes in pmda.c.

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