Okay so get_plugin_class was in keystoneclient and isn't in keystoneauth.
https://review.openstack.org/gitweb?p=openstack/python-keystoneclient.git;a=blob;f=keystoneclient/auth/base.py;h=4754942ac7dcfccf1970dfb9d0e1a76134cc34bd;hb=1e542e14ca16147ad55625a4dbb3ddb19e38d66d#l31
Okay so get_plugin_class was in keystoneclient and isn't in keystoneauth.
https:/ /review. openstack. org/gitweb? p=openstack/ python- keystoneclient. git;a=blob; f=keystoneclien t/auth/ base.py; h=4754942ac7dcf ccf1970dfb9d0e1 a76134cc34bd; hb=1e542e14ca16 147ad55625a4dbb 3ddb19e38d66d# l31