Add keystone v2 keypair methods

To get KeystoneClientV2 to work with StackUser resources, the
missing methods create_stack_domain_user_keypair and
delete_stack_domain_user_keypair have been added.

StackUser._create_keypair has also been modified to tolerate
having a missing id attribute, which is what the v2 API returns.

Change-Id: I9c19c1ca49f72ff1e760e849712c8c9d5fa7541f
Closes-Bug: #1372687

contrib/heat_keystoneclient_v2/heat_keystoneclient_v2/client.py

@@ -223,6 +223,13 @@ def delete_stack_domain_project(self, project_id):
         '''Pass through method since no project was created.'''
         pass
 
+    def create_stack_domain_user_keypair(self, user_id, project_id):
+        return self.create_ec2_keypair(user_id)
+
+    def delete_stack_domain_user_keypair(self, user_id, project_id,
+                                         credential_id):
+        return self.delete_ec2_keypair(user_id, credential_id)
+
     # ###################### #
     # V3 Unsupported Methods #
     # ###################### #

heat/engine/stack_user.py

@@ -132,7 +132,13 @@ def _create_keypair(self):
             raise exception.Error(_("Error creating ec2 keypair for user %s") %
                                   user_id)
         else:
-            self.data_set('credential_id', kp.id, redact=True)
+            try:
+                credential_id = kp.id
+            except AttributeError:
+                # keystone v2 keypairs do not have an id attribute. Use the
+                # access key instead.
+                credential_id = kp.access
+            self.data_set('credential_id', credential_id, redact=True)
             self.data_set('access_key', kp.access, redact=True)
             self.data_set('secret_key', kp.secret, redact=True)
         return kp