Merge changes from topics "bt-hfp-fix-connection-collision-handling",...

Merge changes from topics "bt-hfp-fix-connection-collision-handling", "bt-rfcomm-improve-logging-and-readability", "bt-rfcomm-add-end-to-end-unit-tests"

* changes:
  HFP: Fix connection colision handling
  RFCOMM: Improve logging and readability
  RFCOMM: Add unit tests for connection scenarios