main/xen: Add -s flag to xenstored command again

Was removed in 4.15 but the Alpine start script uses it, and
there might be other users as well.
7 jobs for !20297 with xen-4.15.0 in 7 minutes and 27 seconds
detached
Status Job ID Name Coverage
  Lint
failed #368621
docker-alpine x86_64 allowed to fail
lint

00:00:20

 
  Build
passed #368626
docker-alpine ci-build aarch64
build-aarch64

00:06:17

passed #368627
docker-alpine ci-build armv7
build-armv7

00:00:38

passed #368625
docker-alpine ci-build ppc64le
build-ppc64le

00:00:49

passed #368624
docker-alpine ci-build s390x
build-s390x

00:00:30

passed #368623
docker-alpine ci-build x86
build-x86

00:00:21

passed #368622
docker-alpine ci-build x86_64
build-x86_64

00:06:30

 
Name Stage Failure
failed
lint Lint
No job log