Shorten controller ID in exec-root to not hit UNIX_PATH_MAX
Shorten controller ID in exec-root to not hit UNIX_PATH_MAX

Signed-off-by: Grant Millar <a77018e21d77931d3ce5fad3c8c49c2fb5b8faf8@cylo.io>

paralin/docker,cpuguy83/docker,AkihiroSuda/docker,flavio/docker,Mokolea/docker,trebonian/docker,thaJeztah/docker,jameszhan/docker,docker/docker,jameszhan/docker,moul/docker,paralin/docker,jameszhan/docker,nalind/docker,cpuguy83/docker,thaJeztah/docker,nalind/docker,Ramzec/docker,moul/docker,docker/docker,docker/docker,jimjag/docker,nawawi/docker,cpuguy83/docker,Ramzec/docker,thaJeztah/docker,Mokolea/docker,yosifkit/docker,djs55/docker,AkihiroSuda/docker,gnailuy/docker,mahak/docker,paralin/docker,mahak/docker,gnailuy/docker,mahak/docker,djs55/docker,mahak/docker,nalind/docker,jthelin/docker,bearstech/moby,bearstech/moby,djs55/docker,konstruktoid/docker-upstream,flavio/docker,bearstech/moby,nalind/docker,AkihiroSuda/docker,paralin/docker,konstruktoid/docker-upstream,flavio/docker,Mokolea/docker,vdemeester/docker,moby/moby,moby/moby,AkihiroSuda/docker,nawawi/docker,vdemeester/docker,vdemeester/docker,thaJeztah/docker,moby/moby,cpuguy83/docker,Ramzec/docker,trebonian/docker,gnailuy/docker,jimjag/docker,jimjag/docker,moul/docker,moul/docker,gnailuy/docker,konstruktoid/docker-upstream,Ramzec/docker,konstruktoid/docker-upstream,flavio/docker,nawawi/docker,yosifkit/docker,bearstech/moby,nawawi/docker,jthelin/docker,yosifkit/docker,trebonian/docker,Mokolea/docker,jimjag/docker,trebonian/docker,moby/moby,yosifkit/docker