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