systemd waiting long to shutdown SWUpdate
Under certain situations, systemd is waiting for a long time that
SWUpdate stops. SWUpdate has in fact its own process control management
to monitor its own processes and SIGTERM cannot be sent to the children
by systemd. Add KillMode=mixed option to let SWUpdate to make its job:
systemd will send SIGTERM just to SWUPdate's main process.
Signed-off-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Johannes Schrimpf <johannes.schrimpf@blueye.no>