src/pmlogctl/pmlogctl.sh: small changes
src/pmlogctl/pmlogctl.sh: small changes

- error/warning cleanup as a result of qa testing
- add QA-only hook to _not_ kill a pmlogger (to test some error
  code paths)

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