Fix Identity functional tests to not require OS_AUTH_URL

The Identity functional tests had an assumption that OS_AUTH_URL would
always be present, but when running the functional tests and only setting
OS_CLOUD (using clouds.yaml for creds) this fell down.

Change-Id: Ie589d301f866b06d9f8be8deeb953e03bc01cf09

Author: Dean Troyer

openstackclient/tests/functional/identity/v2/common.py

@@ -44,8 +44,8 @@ def setUpClass(cls):
         # prepare v2 env
         os.environ['OS_IDENTITY_API_VERSION'] = '2.0'
         auth_url = os.environ.get('OS_AUTH_URL')
-        auth_url = auth_url.replace('v3', 'v2.0')
-        os.environ['OS_AUTH_URL'] = auth_url
+        if auth_url:
+            os.environ['OS_AUTH_URL'] = auth_url.replace('v3', 'v2.0')
 
         # create dummy project
         cls.project_name = data_utils.rand_name('TestProject')

openstackclient/tests/functional/identity/v3/common.py

@@ -56,8 +56,8 @@ def setUpClass(cls):
         # prepare v3 env
         os.environ['OS_IDENTITY_API_VERSION'] = '3'
         auth_url = os.environ.get('OS_AUTH_URL')
-        auth_url = auth_url.replace('v2.0', 'v3')
-        os.environ['OS_AUTH_URL'] = auth_url
+        if auth_url:
+            os.environ['OS_AUTH_URL'] = auth_url.replace('v2.0', 'v3')
 
         # create dummy domain
         cls.domain_name = data_utils.rand_name('TestDomain')