increase time-out for reboot and do more clean-up

- increase reboot/online time-out to 4 mins when --reboot-per-package is set
  changed only during reboot
  requires update in tradefed-prebuilt for setters
- add key guard unlock before running each package
  active key guard is causing some accessibility failures

Change-Id: Ib93208b6698e9fe731a6f86d6548dbb1239d49cd