Backward-compatible with old restart_policy

The property 'restart_policy' is changed in spec content [1], but
unfortunately it doesn't change in a backward-compatible way and
breaks the gophercloud CI. This patch fixes it.

[1] https://review.openstack.org/#/c/571398/

Change-Id: Ia623cd54432f83505c93f94680859c492adc4f22

zun/api/controllers/v1/capsules.py

@@ -153,8 +153,13 @@ class CapsuleController(base.Controller):
         capsule_need_memory = 0
         container_volume_requests = []
 
-        capsule_restart_policy = spec_content.get('restart_policy',
-                                                  'always')
+        if spec_content.get('restart_policy'):
+            capsule_restart_policy = spec_content.get('restart_policy')
+        else:
+            # NOTE(hongbin): this is deprecated but we need to maintain
+            # backward-compatibility. Will remove this branch in the future.
+            capsule_restart_policy = template_json.get('restart_policy',
+                                                       'always')
         container_restart_policy = {"MaximumRetryCount": "0",
                                     "Name": capsule_restart_policy}
         new_capsule.restart_policy = capsule_restart_policy

zun/api/controllers/v1/schemas/parameter_types.py

@@ -494,6 +494,10 @@ capsule_template = {
         "kind": capsule_kind,
         "capsuleVersion": capsule_version,
         "metadata": capsule_metadata,
+        # NOTE(hongbin): property 'restartPolicy' is deprecated but we keep
+        # it here for backward-compatibility. Will remove it after the
+        # deprecation period.
+        "restartPolicy": capsule_restart_policy,
         "spec": capsule_spec,
         "availabilityZone": availability_zone,
     },