Use the jenkins testrunner

Use the jenkins testrunner overall, it works also on EPEL.
Add a deps module (repoquery wrapper).
Automate  CheckOwnDirs (#187)
Automate CheckOwnOther (part of #187)
Automate DirectoryRequires (part of #187)
NO-MERGE: patch test_checks for CentOS 6.3
Add a rubygem test, plugging last big hole in plugins testing.
test_misc: bugfix, add test of source.extract()
settings: remove dead code