Fix cluster-resize API

Currently, cluster-resize engine service call will be invoked
with 'strict=None' if user doesn't provide 'strict' value in
request params. In that case, check_size_params will be invoked
with 'strict=None' as well and cause unexpected check result.
This patch tries to address this issue by setting 'strict'
parameter to True by default in API layer.

Change-Id: Icd6a36afbb13956f8f09d9c45bd2aeb1c9bd1d1b

senlin/api/openstack/v1/clusters.py

@@ -250,6 +250,8 @@ class ClusterController(wsgi.Controller):
                                              min_step)
         if strict is not None:
             strict = utils.parse_bool_param(consts.ADJUSTMENT_STRICT, strict)
+        else:
+            strict = True
 
         result = self.rpc_client.cluster_resize(req.context, cluster_id,
                                                 adj_type, number, min_size,

senlin/tests/unit/api/openstack/v1/test_clusters.py

@@ -1215,7 +1215,7 @@ class ClusterControllerTest(shared.ControllerTest, base.SenlinTestCase):
                 'min_size': None,
                 'max_size': -1,
                 'min_step': None,
-                'strict': None
+                'strict': True
             })
         )
         self.assertEqual(eng_resp, resp)
@@ -1257,7 +1257,7 @@ class ClusterControllerTest(shared.ControllerTest, base.SenlinTestCase):
                 'min_size': 2,
                 'max_size': -1,
                 'min_step': None,
-                'strict': None
+                'strict': True
             })
         )
         self.assertEqual(eng_resp, resp)