Adds DELETE /v2/plans/:plan_uuid/:role_name/:role_version

This patch adds hollow
DELETE /v2/plans/:plan_uuid/:role_name/:role_version
endpoint which returns only dummy response.
Logic to manipulate real data will be added later.

Change-Id: If97195b3a1ac4f7a1003b04414742a03c946efd3
Implements: blueprint tripleo-juno-tuskar-plan-rest-api

tuskar/api/controllers/v2/roles.py

@@ -68,3 +68,26 @@ class RolesController(rest.RestController):
             'roles': [role]
         })
         return plan
+
+    @wsme_pecan.wsexpose(models.Plan,
+                         str,
+                         str,
+                         str)
+    def delete(self, plan_uuid, role_name, role_version):
+        """Removes a role from given plan.
+
+        :param plan_uuid: identifies the plan
+        :type  plan_uuid: str
+
+        :param role_name: identifies the role to be deleted from plan
+        :type  role_name: str
+
+        :param role_version: identifies the version of role to be deleted
+        :type  role_version: str
+       """
+
+        plan = models.Plan(**{
+            'uuid': '42',
+            'name': 'foo',
+        })
+        return plan

tuskar/tests/api/controllers/v2/test_roles.py

@@ -57,3 +57,15 @@ class RolesTests(base.TestCase):
         self.assertEqual(result['uuid'], '42')
         self.assertEqual(result['name'], 'foo')
         self.assertEqual(result['roles'][0]['uuid'], 'qwert12345')
+
+    def test_delete(self):
+        # Setup
+
+        # Test
+        response = self.app.delete_json(URL_PLAN_ROLES + '/role_name/role_ver')
+        result = response.json
+
+        # Verify
+        self.assertEqual(response.status_int, 200)
+        self.assertEqual(result['uuid'], '42')
+        self.assertEqual(result['name'], 'foo')