Allow hidden templated vars

Change-Id: Id74fe2a8a7b7156e045fd0b1d3f232ac05964f53

grafana_dashboards/schema/template/query.py

@@ -26,6 +26,7 @@ class Query(Base):
             v.Required('query', default=''): v.All(str),
             v.Required('refresh', default=False): v.All(bool),
             v.Optional('datasource'): v.All(str),
+            v.Optional('hide'): v.All(int, v.Range(min=0, max=2)),
         }
         query.update(self.base)
         return v.Schema(query)

tests/schema/fixtures/dashboard-0023.json

@@ -52,6 +52,7 @@
                 "list": [
                     {
                         "datasource": "graphite",
+                        "hide": 0,
                         "includeAll": false,
                         "multi": false,
                         "name": "hostname",

tests/schema/fixtures/dashboard-0023.yaml

@@ -5,6 +5,7 @@ dashboard:
       datasource: graphite
       query: node*
       refresh: true
+      hide: 0
   title: New dashboard
   rows:
     - title: New row