Merge changes Id26bbbb2,Ib993c4d8,Ic6a79ab9,I6e46ee55,Ie3e2e890, ...

* changes:
  floss: Handle register_disconnect for btmanagerd
  floss: Refactor btmanagerd to get rid of select!
  floss: Create PID file when gd shim is init
  Use init flag for hci device if property not found
  floss: Accept --hci init flag
  gd: Alarm should take const ref, not mut