Drop version from OS_AUTH_URL

We're configuring OS_IDENTITY_API_VERSION so the /v3 is not really
necessary. Additionally, the string replace being used is resulting in a
// in the url.

Depends-On: Ia41d21ebad9329ae9fa506868957a72e6f9a5ca5
Change-Id: Id8f2ec0d78eec7276b7d4f82782d64e4edde6302
Closes-Bug: #1785660

releasenotes/notes/overcloudrc-versionless-keystone-endpoint-9cdc1a4e1341a933.yaml

@@ -0,0 +1,7 @@
+---
+other:
+  - |
+    Switched to a versionless Keystone url in the overcloudrc. Previously,
+    /v3 was being appended to the OS_AUTH_URL url but is not required when
+    configuring OS_IDENTITY_API_VERSION
+

tripleo_common/tests/utils/test_overcloudrc.py

@@ -44,3 +44,7 @@ class OvercloudRcTest(base.TestCase):
         self.assertIn(overcloudrc.CLOUDPROMPT, result['overcloudrc.v3'])
         self.assertIn("OS_AUTH_TYPE=password", result['overcloudrc'])
         self.assertIn("OS_AUTH_TYPE=password", result['overcloudrc.v3'])
+        self.assertIn("OS_AUTH_URL=http://foo.com:8000/",
+                      result['overcloudrc'])
+        self.assertIn("OS_AUTH_URL=http://foo.com:8000/",
+                      result['overcloudrc.v3'])

tripleo_common/utils/overcloudrc.py

@@ -100,7 +100,7 @@ def create_overcloudrc(stack, no_proxy, admin_password):
                            'SSLContext object is not available"'),
         'OS_AUTH_TYPE': 'password',
         'OS_PASSWORD': admin_password,
-        'OS_AUTH_URL': overcloud_endpoint.replace('/v2.0', '') + '/v3',
+        'OS_AUTH_URL': overcloud_endpoint.replace('/v2.0', ''),
         'OS_IDENTITY_API_VERSION': '3',
         'OS_IMAGE_API_VERSION': constants.DEFAULT_IMAGE_API_VERSION,
         'OS_VOLUME_API_VERSION': constants.DEFAULT_VOLUME_API_VERSION,