pmapi.py: improve timezone helpers
pmapi.py: improve timezone helpers

1) Fix a last-minute brown paper bag typo
2) Fix for pmrep -z -H -k -o csv -a bug1057.meta ""
3) Add a Red Hat Bugzilla reference
4) More consistent variable naming

pmrep -k will be introduced in a follow-up patch with QA.

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