Use the library method auth_uri_transform

Use the library method auth_uri_transform and remove the authtoken
configuration from api-paste.ini.

Change-Id: I46d10bf9b3707c16c3d2ddc84171968ecc4e46a1
Imlements: blueprint move-keystone-authtoken-move-auth-uri-logic
Merge "Use the library method auth_uri_transform"