Test cases for Bluetooth Avrcp/A2dp profiles.  First cut.

Add test cases for testing
1. Connect/Disconnect on the A2DP profile from both SRC and SNK
2. Verify Passthrough commands (Play/Pause/SkipNext/SkipPrev) sent from Avrcp CT
    are received on the TGT.
Also added an util function to disconnect on specific list of profiles.
Ran yapf on the bt_test_utils.py.

Bug:  b/29097732
      b/28913426
      b/29100401
Change-Id: I2a0b214b68841e0c253141cd030eb08869f687c7
7 files changed
tree: ad96c393fc2d5ddb57adc6c7ee8e4994d7747051
  1. acts/
  2. Android.mk