The case where we reboot with flight mode being enable is still valid. I
did some further analysis on this as I stumbled upon this again during
my current BlueZ 5 work and the underlaying problems goes down to the
kernel.

The bluetooth driver we have on krillin isn't implemented as a module
but is initialized by a subsystem it uses. It now turns out that this is
bound to the WiFi driver being initialized too. If WiFi doesn't get
enabled at boot time the Bluetooth driver can proceed providing a HCI
device and we end up without any Bluetooth functionality.

Needs further investigation on the kernel side what we can do to work
around this.

** Tags added: krillin

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https://bugs.launchpad.net/bugs/1421249

Title:
  bluetooth can not be enabled sometimes (when booting with flight mode
  on being one case)

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