vendor.conf: reserve space for downstream projects
vendor.conf: reserve space for downstream projects

This helps merge conflicts in situations where downstream
projects have additional dependencies.

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

djs55/docker,yosifkit/docker,jlhawn/docker,unclejack/docker,Ramzec/docker,flavio/docker,paralin/docker,ibuildthecloud/docker,mahak/docker,gnailuy/docker,moul/docker,moby/moby,jimjag/docker,AkihiroSuda/docker,nawawi/docker,pradipd/moby,mahak/docker,djs55/docker,nawawi/docker,jlhawn/docker,konstruktoid/docker-upstream,estesp/docker,jimjag/docker,vdemeester/docker,justincormack/docker,unclejack/docker,konstruktoid/docker-upstream,paralin/docker,rremer/moby,Ramzec/docker,vdemeester/docker,gnailuy/docker,AkihiroSuda/docker,trebonian/docker,jimjag/docker,bearstech/moby,jthelin/docker,yosifkit/docker,mikebrow/docker,tmp6154/docker,pradipd/moby,jimjag/docker,moul/docker,bearstech/moby,docker/docker,thaJeztah/docker,jameszhan/docker,kojiromike/docker,crosbymichael/docker,cpuguy83/docker,yongtang/docker,tmp6154/docker,nawawi/docker,flavio/docker,jvanz/docker,cpuguy83/docker,moul/docker,AkihiroSuda/docker,Ramzec/docker,jameszhan/docker,cpuguy83/docker,mikebrow/docker,dims/docker,mahak/docker,justincormack/docker,crosbymichael/docker,konstruktoid/docker-1,ibuildthecloud/docker,moby/moby,Mokolea/docker,yosifkit/docker,yosifkit/docker,kolyshkin/moby,kolyshkin/moby,konstruktoid/docker-1,Mokolea/docker,gnailuy/docker,nalind/docker,gnailuy/docker,justincormack/docker,moul/docker,ibuildthecloud/docker,yongtang/docker,paralin/docker,unclejack/docker,konstruktoid/docker-1,estesp/docker,Mokolea/docker,kojiromike/docker,yongtang/docker,nalind/docker,jvanz/docker,trebonian/docker,paralin/docker,dims/docker,jvanz/docker,thaJeztah/docker,djs55/docker,nalind/docker,Ramzec/docker,thaJeztah/docker,bearstech/moby,trebonian/docker,konstruktoid/docker-upstream,jthelin/docker,cpuguy83/docker,moby/moby,SvenDowideit/docker,nalind/docker,jlhawn/docker,trebonian/docker,ibuildthecloud/docker,kojiromike/docker,crosbymichael/docker,nawawi/docker,vdemeester/docker,thaJeztah/docker,bearstech/moby,AkihiroSuda/docker,tmp6154/docker,Mokolea/docker,estesp/docker,rremer/moby,flavio/docker,SvenDowideit/docker,kolyshkin/moby,flavio/docker,jameszhan/docker,docker/docker,mikebrow/docker,docker/docker,rremer/moby,konstruktoid/docker-upstream,pradipd/moby,SvenDowideit/docker,mahak/docker,ibuildthecloud/docker,dims/docker,moby/moby