Cert: Free resources occupying required ports during setup

* For ports that are supposed to be listening on host, kill
  processes that occupy these ports using psutil
* For ports that are supposed to be adb and maybe ssh forward
  from Android device to host machine:
  1. Try to cancel any existing port forwarding or reversal
     for those ports
  2. If port portwarding or reversal still fails, try rebooting
     Android once and try again before failing the test

Bug: 153274925
Test: gd/cert/run --host
Change-Id: I28b430366f4a241ce07a79155f6260db1e8b57f9