Update Available para link of keystone v3 client

Some ref urls of keystone v3 clients is changed
in http://developer.openstack.org, so this is to
update available para links in keystone v3 clients

Change-Id: Ifb7126bd6473e728606d3468eabddf4c52946cb9
diff --git a/tempest/services/identity/v3/json/credentials_client.py b/tempest/services/identity/v3/json/credentials_client.py
index 55eeee4..c063cae 100644
--- a/tempest/services/identity/v3/json/credentials_client.py
+++ b/tempest/services/identity/v3/json/credentials_client.py
@@ -14,7 +14,7 @@
 #    under the License.
 
 """
-http://developer.openstack.org/api-ref-identity-v3.html#credentials
+http://developer.openstack.org/api-ref/identity/v3/index.html#credentials
 """
 
 from oslo_serialization import jsonutils as json
@@ -30,7 +30,7 @@
         """Creates a credential.
 
         Available params: see http://developer.openstack.org/
-                              api-ref-identity-v3.html#create-credential
+                              api-ref/identity/v3/index.html#create-credential
         """
         post_body = json.dumps({'credential': kwargs})
         resp, body = self.post('credentials', post_body)
@@ -43,7 +43,7 @@
         """Updates a credential.
 
         Available params: see http://developer.openstack.org/
-                              api-ref-identity-v3.html#update-credential
+                              api-ref/identity/v3/index.html#update-credential
         """
         post_body = json.dumps({'credential': kwargs})
         resp, body = self.patch('credentials/%s' % credential_id, post_body)
@@ -56,7 +56,8 @@
         """To GET Details of a credential.
 
         For API details, see http://developer.openstack.org/
-                             api-ref-identity-v3.html#show-credential-details
+                             api-ref/identity/v3/index.html#
+                             show-credential-details
         """
         resp, body = self.get('credentials/%s' % credential_id)
         self.expected_success(200, resp.status)