pmdaopenmetrics: add an etcd configuration for reference
pmdaopenmetrics: add an etcd configuration for reference

(not installed at this time, just added to the git repo)

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