Fix parameter in auth error message

Using Idenitity V3 auth method the AuthenticationFailure exception waits for
the project name parameter to show it's message correctly.

Change-Id: I1458f6c20cf65057663ecbf52a931c288fd4275c
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index 9aca2ff..64b6b87 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -282,7 +282,8 @@
                            " (auth URL is '%s'), the response status is %s" %
                            (req_url, resp.status))
             raise exceptions.AuthenticationFailure(user=user,
-                                                   password=password)
+                                                   password=password,
+                                                   tenant=project_name)
 
     def expected_success(self, expected_code, read_code):
         assert_msg = ("This function only allowed to use for HTTP status"