Do not start/stop logcat invocation for TcpDevice

TcpDevice lifecycle starts later so no device is available
at early stage. These device will handle the logcat start
and stop themselves based on when they are up.

Test: unit tests, run google-gce-cts-launcher
Bug: 34571399
Change-Id: I6164c7a0f508d2ee18eaca0ce9c24324451d164d
2 files changed