Adds command to send logcat output over vsock

The command takes a port, connects to it on the host's cid and sends
the output from logcat. If the logcat process exits for some reason it
sends a message down the socket and restarts logcat.

Bug: 124535805
Test: run locally
Change-Id: Icd6e97ed480cc9a06135480b1d587c2aca9c6bd4