Fixing JsonParser.get_state to return proper metric type

Change-Id: Idad85003f7ecf916b8abce2f0c1a4e47bf2d62f3
Merge branches 'origin' and 'master' into debian
Updating changelog with recent change from master

Change-Id: Ib2b9eb9abebc10c1cf101b5f4adf1db5382371c9