Fix version replacement when path

When an API server is on an unversioned path (for example, keystone
is on http://localhost/identity), verify-config would fail with a
404 Not Found because the version wasn't put on the URL as required
(for example, the v2.0 keystone url should have been
http://localhost/identity/v2.0 but was instead
http://localhost/identity). This is because the version replacement
code wasn't adding the version when it wasn't present and a path
was there.

Change-Id: I559bd967a87b646906f37df81a7db096148488db

tempest/lib/auth.py

@@ -34,13 +34,15 @@ LOG = logging.getLogger(__name__)
 def replace_version(url, new_version):
     parts = urlparse.urlparse(url)
     version_path = '/%s' % new_version
-    path = re.sub(r'(^|/)+v\d+(?:\.\d+)?',
-                  version_path,
-                  parts.path,
-                  count=1)
+    path, subs = re.subn(r'(^|/)+v\d+(?:\.\d+)?',
+                         version_path,
+                         parts.path,
+                         count=1)
+    if not subs:
+        path = '%s%s' % (parts.path.rstrip('/'), version_path)
     url = urlparse.urlunparse((parts.scheme,
                                parts.netloc,
-                               path or version_path,
+                               path,
                                parts.params,
                                parts.query,
                                parts.fragment))

tempest/tests/lib/test_auth.py

@@ -599,21 +599,18 @@ class TestReplaceVersion(base.TestCase):
             auth.replace_version('http://localhost:35357', 'v2.0'))
 
     def test_no_version_base_solidus(self):
-        # TODO(blk-u): This doesn't look like it works as expected.
         self.assertEqual(
-            'http://localhost:35357/',
+            'http://localhost:35357/v2.0',
             auth.replace_version('http://localhost:35357/', 'v2.0'))
 
     def test_no_version_path(self):
-        # TODO(blk-u): This doesn't look like it works as expected.
         self.assertEqual(
-            'http://localhost/identity',
+            'http://localhost/identity/v2.0',
             auth.replace_version('http://localhost/identity', 'v2.0'))
 
     def test_no_version_path_solidus(self):
-        # TODO(blk-u): This doesn't look like it works as expected.
         self.assertEqual(
-            'http://localhost/identity/',
+            'http://localhost/identity/v2.0',
             auth.replace_version('http://localhost/identity/', 'v2.0'))
 
     def test_path_version(self):