Add 2 small fixes to the JSON PMDA.
Add 2 small fixes to the JSON PMDA.

* src/pmdas/json/pmdajson.python: Add a 'log' function to all
  classes. Allow more than one '.' in metric names.

adfernandes/pcp,tjanez/pcp,tjanez/pcp,adfernandes/pcp,aeg-aeg/pcpfans,adfernandes/pcp,prasincs/pcp,wuliming/pcp,wuliming/pcp,edwardt/pcp,prasincs/pcp,wuliming/pcp,edwardt/pcp,adfernandes/pcp,tjanez/pcp,edwardt/pcp,tjanez/pcp,prasincs/pcp,prasincs/pcp,aeg-aeg/pcpfans,wuliming/pcp,prasincs/pcp,adfernandes/pcp,wuliming/pcp,tjanez/pcp,wuliming/pcp,tjanez/pcp,edwardt/pcp,tjanez/pcp,edwardt/pcp,adfernandes/pcp,aeg-aeg/pcpfans,adfernandes/pcp,aeg-aeg/pcpfans,tjanez/pcp,prasincs/pcp,prasincs/pcp,prasincs/pcp,edwardt/pcp,wuliming/pcp,aeg-aeg/pcpfans,edwardt/pcp,aeg-aeg/pcpfans,wuliming/pcp,edwardt/pcp,aeg-aeg/pcpfans,adfernandes/pcp,aeg-aeg/pcpfans