bitbake: toaster: task with outcome 2 (sstate), should have sstate_result!=0

bitbake: toaster: task with outcome 2 (sstate), should have sstate_result!=0

0 (not applicable) is not a valid sstate_result for tasks with
outcome 2 (sstate), which should return 3 (restored), 2
(failed) or 1 (missed).
Sstate_result for tasks with outcome 2 is equal to the outcome
of _setscene corespondent task.

[YOCTO #5220]
(Bitbake rev: 8ff8d75318ea88ba80c744b471e486901ef6749a)

Signed-off-by: Cristiana Voicu <cristiana.voicu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>