Revert "Add keystone v3 support to client"

This change broke package.create feature of python-muranoclient

This reverts commit 65f51420e559482224d69ce4bf30d02122f7c755.

Change-Id: I52af65d954ea2ff46a012026190b21ab1bdf75d7
Merge "Revert "Add keystone v3 support to client""