This patch adds the capability to have the Toaster UI
detect when the Bitbake server exited and cleanly
trigger a clean shutdown of the system through the toaster
starting script.

(Bitbake rev: a9cfa3eacfc99550e1ad3f8bb61b2a0bc9b44332)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>