Merge changes from topic "vts_cec_10"

* changes:
  CEC: Add VTS test to get physical address
  CEC: Add methods to get device types
  CEC: Add VTS test to check is connected
  CEC: Add README for VTS tests
  CEC: Add VTS test to enable audio return channel
  CEC: Add VTS test to get port info
  CEC: Add VTS test to set language
  CEC: Add VTS test to set option
  CEC: Add VTS test to send CEC messages
  CEC: Add VTS test to clear and add logical address
  CEC: Add VTS test to get Vendor Id
  CEC: Add VTS test to get CEC version