[init] booster-qt5 started in boot-mode and signaled when boot is over

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
use killall instead of kill

Signed-off-by: Pekka Lundstrom <pekka.lundstrom@jollamobile.com>
Merge pull request #4 from plundstr/master

booster-qt5 started in boot-mode and signaled when boot is over