Update action json schema

Power-off actions created by the energy saving strategy include
a resource name property, which currently isn't part of the
action json schema. For this reason, json schema validation fails.

  Additional properties are not allowed ('resource_name' was unexpected)

We'll update the json schema, including the resource name property.

Change-Id: I924d36732a917c0be98b08c2f4128e9136356215

watcher/applier/actions/change_node_power_state.py

@@ -59,6 +59,10 @@ class ChangeNodePowerState(base.BaseAction):
                     'type': 'string',
                     "minlength": 1
                 },
+                'resource_name': {
+                    'type': 'string',
+                    "minlength": 1
+                },
                 'state': {
                     'type': 'string',
                     'enum': [NodeState.POWERON.value,