contrib: remove download-frozen-image-v1 script
contrib: remove download-frozen-image-v1 script

I don't think we still had a use for this script, and if someone
needs this, it'll still be accessible in older tags/releases.

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

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