squash! documentation: Move __init__ docstrings to classes

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
fixup! documentation: Move __init__ docstrings to classes
dockercmd: Raise Except. if subargs is a string

Signed-off-by: James Molet <jmolet@redhat.com>
dockertest: Mass-docstring + pep8 fix/cleanup

Signed-off-by: Chris Evich <cevich@redhat.com>
dockertest: Minor cleanups

*  Fully deprecated OutputGoodBase.output_good and
   updated unittests.

*  Officially declared environment.AllGoodBase.__init__
   as abstract.

*  Removed unnecessary TODO comment

Signed-off-by: Chris Evich <cevich@redhat.com>