Improve logging for visual voicemail CTS Verifier Test Improved the logging in the VVM CTS verifier test. It was previously impossible to correlate logs to test steps. These additional logs make it possible to determine which test step failed and to then be able to look at Telephony logs for more insight into what happened. Test: This itself is a test; verified logging in logcat is present. Flag: EXEMPT bugfix Bug: 354090891 Change-Id: Ic13d8ecc70c105f8b5b93f3f6dca9a67888d0835