Merge changes I1685fabd,Ia789132e,I4b0ed942,I9607c58f,Ie9efd0e2

* changes:
  RootCanal: Add Reset command to handler
  Track phys in Device in a list
  RootCanal: Schedule device and phy deletions
  RootCanal: Use CancelAsyncTask in test_environment
  RootCanal: Use Device::Send in devices