rootless: support forwarding signals from RootlessKit to dockerd
rootless: support forwarding signals from RootlessKit to dockerd

See https://github.com/rootless-containers/rootlesskit/pull/127

RootlessKit changes: https://github.com/rootless-containers/rootlesskit/compare/v0.9.1...v0.9.2

Signed-off-by: Akihiro Suda <10ddef0dea2a66ab193b07198faa879adcb213d8@hco.ntt.co.jp>

estesp/docker,cpuguy83/docker,nawawi/docker,flavio/docker,bearstech/moby,mahak/docker,jameszhan/docker,nalind/docker,moul/docker,moby/moby,docker/docker,konstruktoid/docker-upstream,bearstech/moby,trebonian/docker,trebonian/docker,flavio/docker,konstruktoid/docker-1,thaJeztah/docker,vdemeester/docker,nalind/docker,ibuildthecloud/docker,kojiromike/docker,thaJeztah/docker,paralin/docker,trebonian/docker,ibuildthecloud/docker,yosifkit/docker,jimjag/docker,gnailuy/docker,dims/docker,cpuguy83/docker,djs55/docker,jimjag/docker,cpuguy83/docker,yosifkit/docker,gnailuy/docker,nalind/docker,AkihiroSuda/docker,paralin/docker,Ramzec/docker,Ramzec/docker,konstruktoid/docker-upstream,yosifkit/docker,nawawi/docker,Mokolea/docker,yosifkit/docker,vdemeester/docker,jvanz/docker,moul/docker,nawawi/docker,gnailuy/docker,thaJeztah/docker,justincormack/docker,paralin/docker,ibuildthecloud/docker,trebonian/docker,flavio/docker,cpuguy83/docker,Ramzec/docker,moby/moby,bearstech/moby,jimjag/docker,mahak/docker,gnailuy/docker,moby/moby,nalind/docker,vdemeester/docker,moby/moby,docker/docker,djs55/docker,dims/docker,jameszhan/docker,dims/docker,moul/docker,AkihiroSuda/docker,djs55/docker,Mokolea/docker,moul/docker,jimjag/docker,flavio/docker,jameszhan/docker,justincormack/docker,konstruktoid/docker-1,nawawi/docker,paralin/docker,jvanz/docker,docker/docker,mahak/docker,jvanz/docker,kojiromike/docker,justincormack/docker,jthelin/docker,thaJeztah/docker,estesp/docker,ibuildthecloud/docker,estesp/docker,Mokolea/docker,konstruktoid/docker-upstream,kojiromike/docker,Mokolea/docker,konstruktoid/docker-upstream,mahak/docker,AkihiroSuda/docker,bearstech/moby,jthelin/docker,Ramzec/docker,ibuildthecloud/docker,AkihiroSuda/docker,konstruktoid/docker-1