Accept v2 params to v3 service create
Accept v2 params to v3 service create

v2 clouds exist. So do v3 clouds. If the cloud is v3 but the user
tries v2 names, just do the right thing.

Change-Id: Iaceff4b2e3e6faf3923ae08064c6bddb264df514

klmitch/python-keystoneclient,klmitch/python-keystoneclient