Add default body for non-abstract empty methods
Add default body for non-abstract empty methods

Some non-abstract methods only have docstring with no content,
this just add a default content to those function.

Change-Id: Idcf5b9f6ed766d3bc1541e158bdd8e58b06223e2

darren-wang/ksc,klmitch/python-keystoneclient,magic0704/python-keystoneclient,magic0704/python-keystoneclient,darren-wang/ksc,ging/python-keystoneclient,klmitch/python-keystoneclient,ging/python-keystoneclient,sdpp/python-keystoneclient,Mercador/python-keystoneclient,sdpp/python-keystoneclient,Mercador/python-keystoneclient