Core: avoid importing Metadata before Django has been configured
POSIXUsers: Fix traceback

Signed-off-by: Sol Jerome <sol.jerome@gmail.com>
Cfg: Give non-specific handlers a default specificity
testsuite: add "encoding" to setup for POSIXUsers tests
Cfg: allow changing category specific-ness of generated authorized_keys
Merge branch 'maint'

Conflicts:
	src/lib/Bcfg2/Server/Plugins/Cfg/CfgAuthorizedKeysGenerator.py
	src/lib/Bcfg2/Server/Plugins/Cfg/__init__.py
	testsuite/Testsrc/Testlib/TestClient/TestTools/TestPOSIXUsers.py