Update player reject respose ,play status and play pos notification changes

1. Added handling of player setting attribute change event
   rejection on addressed player change.

2. Play status and play pos notifications related modifications
  - Playback state was not being sent when state wasn't sent
    accompanying a metadata change
  - Play state was being sent without an update
  - Position was being sent without a change and with the wrong
    indicator
  - Position was not being scheduled for update when playing.
  - Position was being scheduled for update when paused / stopped.

CRs-Fixed: 1050403
Change-Id: I2e1a22ea7ad485098d38eed5f08014b279028a94