Cert: Split device based test logcat to separate files

* Split device based test logcat to seaparate files
* Add ability to live stream logcat output to stdout in
  --verbose mode

Bug: 145007149
Test: gd/cert/run --verbose
Tag: #gd-refactor
Change-Id: Ie3c81fef004458ea75b2c8b7e64ba4a05dd09241