daemon.UsingSystemd(): don't call getCD() multiple times
daemon.UsingSystemd(): don't call getCD() multiple times

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

bearstech/moby,moby/moby,mahak/docker,bearstech/moby,docker/docker,thaJeztah/docker,cpuguy83/docker,flavio/docker,jimjag/docker,moby/moby,moul/docker,Ramzec/docker,jimjag/docker,nawawi/docker,trebonian/docker,nalind/docker,bearstech/moby,nalind/docker,cpuguy83/docker,nalind/docker,yosifkit/docker,cpuguy83/docker,moby/moby,Ramzec/docker,thaJeztah/docker,jameszhan/docker,jthelin/docker,gnailuy/docker,Mokolea/docker,jimjag/docker,gnailuy/docker,moby/moby,Ramzec/docker,yosifkit/docker,konstruktoid/docker-upstream,nawawi/docker,Mokolea/docker,moul/docker,jameszhan/docker,mahak/docker,Mokolea/docker,yosifkit/docker,jameszhan/docker,jimjag/docker,mahak/docker,flavio/docker,yosifkit/docker,trebonian/docker,konstruktoid/docker-upstream,konstruktoid/docker-upstream,nalind/docker,trebonian/docker,bearstech/moby,moul/docker,docker/docker,vdemeester/docker,vdemeester/docker,moul/docker,konstruktoid/docker-upstream,thaJeztah/docker,Ramzec/docker,trebonian/docker,flavio/docker,Mokolea/docker,thaJeztah/docker,nawawi/docker,mahak/docker,gnailuy/docker,flavio/docker,gnailuy/docker,cpuguy83/docker,nawawi/docker,vdemeester/docker,jthelin/docker,docker/docker