Add 'database' to the datasource schema

The database option is supported by influxdb type
but missing in the schema

Change-Id: Id993a8e31e6df4d6374ecccd16dfb6c70ea54c45

grafana_dashboards/schema/datasource.py

@@ -26,5 +26,6 @@ class Datasource(object):
                                                           'influxdb'),
             v.Required('url'): v.All(str, v.Length(min=1)),
             v.Optional('orgId'): int,
+            v.Optional('database'): v.All(str, v.Length(min=1)),
         }
         return datasource

tests/schema/fixtures/datasource-0002.json

@@ -0,0 +1,12 @@
+{
+    "datasource": {
+        "new-datasource": {
+            "access": "direct",
+            "database": "foodb",
+            "isDefault": false,
+            "name": "New datasource",
+            "type": "influxdb",
+            "url": "http://example.org"
+        }
+    }
+}

tests/schema/fixtures/datasource-0002.yaml

@@ -0,0 +1,5 @@
+datasource:
+  name: New datasource
+  url: http://example.org
+  type: influxdb
+  database: foodb