Make sure broadcast queue is valid broadcasting
Make sure broadcast queue is valid broadcasting

When broadcasting table event, make sure the broadcast queue is
valid. The network may have been removed while in the process of sending
the broadcast.

Signed-off-by: Jana Radhakrishnan <045898bda7d4800fe4909a9831e702ab79e266be@docker.com>

kolyshkin/libnetwork,cpuguy83/libnetwork,WeiZhang555/libnetwork,abhi/libnetwork,vdemeester/libnetwork,allencloud/libnetwork,msabansal/libnetwork,coolljt0725/libnetwork,msabansal/libnetwork,mahak/libnetwork,medallia/libnetwork,abhi/libnetwork,medallia/libnetwork,ityangchen/libnetwork,mavenugo/libnetwork,YujiOshima/libnetwork,medallia/libnetwork,tmakita/libnetwork,coolljt0725/libnetwork,curtiszimmerman/libnetwork,WeiZhang555/libnetwork,mahak/libnetwork,curtiszimmerman/libnetwork,vdemeester/libnetwork,tmakita/libnetwork,fcrisciani/libnetwork,sainath14/libnetwork,mYmNeo/libnetwork,mbanikazemi/libnetwork,docker/libnetwork,fcrisciani/libnetwork,YujiOshima/libnetwork,allencloud/libnetwork,mavenugo/libnetwork,sainath14/libnetwork,mYmNeo/libnetwork,mahak/libnetwork,ityangchen/libnetwork,vdemeester/libnetwork,cpuguy83/libnetwork,mbanikazemi/libnetwork,kolyshkin/libnetwork,docker/libnetwork,abhi/libnetwork,docker/libnetwork,kolyshkin/libnetwork