Allows identity endpoint to be specified as URI

Deprecates the piecemeal identity URL buildup and
replaces with a simple uri configuration setting.
Gets rid of the /tokens path stuff that was not
necessary to have in configuration file.

Change-Id: I5e80177073f756781f813438d054fede2d6334a3
diff --git a/tempest/tests/compute/base.py b/tempest/tests/compute/base.py
index 8044d01..c44a2f1 100644
--- a/tempest/tests/compute/base.py
+++ b/tempest/tests/compute/base.py
@@ -89,7 +89,7 @@
             cls.config,
             cls.config.identity_admin.username,
             cls.config.identity_admin.password,
-            cls.config.identity.auth_url
+            cls.config.identity.uri
         )
 
     @classmethod