Reuse existing docker chain constant in link.go
Reuse existing docker chain constant in link.go

- in bridge driver

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

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