sample pmda - make sample.const_rate.value available to pmstore
sample pmda - make sample.const_rate.value available to pmstore

For QA, I'd like to be able to reset this counter, so the
subsequent sequence of values is deterministic.

tjanez/pcp,adfernandes/pcp,prasincs/pcp,prasincs/pcp,mbaldessari/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,adfernandes/pcp,adfernandes/pcp,andyvand/cygpcpfans,tjanez/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,mbaldessari/pcp,edwardt/pcp,tjanez/pcp,adfernandes/pcp,prasincs/pcp,mbaldessari/pcp,aeg-aeg/pcpfans,edwardt/pcp,prasincs/pcp,prasincs/pcp,tjanez/pcp,andyvand/cygpcpfans,prasincs/pcp,wuliming/pcp,edwardt/pcp,aeg-aeg/pcpfans,edwardt/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,wuliming/pcp,mbaldessari/pcp,tjanez/pcp,adfernandes/pcp,wuliming/pcp,wuliming/pcp,wuliming/pcp,tjanez/pcp,tjanez/pcp,wuliming/pcp,aeg-aeg/pcpfans,prasincs/pcp,edwardt/pcp,wuliming/pcp,edwardt/pcp,andyvand/cygpcpfans,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,adfernandes/pcp,aeg-aeg/pcpfans,edwardt/pcp,aeg-aeg/pcpfans,edwardt/pcp,adfernandes/pcp,mbaldessari/pcp,wuliming/pcp,adfernandes/pcp,tjanez/pcp