Allow to update device notes column from STF UI. https://github.com/openstf/stf/issues/124

lib/db/api.js

@@ -258,6 +258,12 @@ dbapi.setDeviceRotation = function(serial, rotation) {
   }))
 }
 
+dbapi.setDeviceNote = function(serial, note) {
+  return db.run(r.table('devices').get(serial).update({
+    notes: note
+  }))
+}
+
 dbapi.setDeviceReverseForwards = function(serial, forwards) {
   return db.run(r.table('devices').get(serial).update({
     reverseForwards: forwards