Skip defaultGw check if sandbox is being deleted
Skip defaultGw check if sandbox is being deleted

- On Sandbox deletion, during Leave of each
  connected endpoint, avoid the default gw
  check, which may create an unnecessary
  connection to the default gateway network.

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

kolyshkin/libnetwork,anortef/libnetwork,kolyshkin/libnetwork,mavenugo/libnetwork,pyakpyak/libnetwork,amitkris/libnetwork,curtiszimmerman/libnetwork,tmakita/libnetwork,docker/libnetwork,mavenugo/libnetwork,mYmNeo/libnetwork,YujiOshima/libnetwork,vdemeester/libnetwork,vdemeester/libnetwork,WeiZhang555/libnetwork,tmakita/libnetwork,mahak/libnetwork,mbanikazemi/libnetwork,medallia/libnetwork,medallia/libnetwork,runcom/libnetwork,tgraf/libnetwork,amitkris/libnetwork,hackersdotmu/libnetwork,fcrisciani/libnetwork,medallia/libnetwork,sainath14/libnetwork,allencloud/libnetwork,ityangchen/libnetwork,abhi/libnetwork,coolljt0725/libnetwork,abhi/libnetwork,kolyshkin/libnetwork,runcom/libnetwork,cpuguy83/libnetwork,allencloud/libnetwork,jmzwcn/libnetwork,jmzwcn/libnetwork,YujiOshima/libnetwork,mahak/libnetwork,pyakpyak/libnetwork,aboch/libnetwork_new,aboch/libnetwork_new,fcrisciani/libnetwork,docker/libnetwork,vdemeester/libnetwork,ityangchen/libnetwork,cpuguy83/libnetwork,sainath14/libnetwork,hackersdotmu/libnetwork,msabansal/libnetwork,WeiZhang555/libnetwork,tgraf/libnetwork,jimmycmh/libnetwork,msabansal/libnetwork,coolljt0725/libnetwork,mYmNeo/libnetwork,mbanikazemi/libnetwork,jimmycmh/libnetwork,mahak/libnetwork,docker/libnetwork,abhi/libnetwork,anortef/libnetwork,curtiszimmerman/libnetwork