Add netlink hooks to delete a bridge dev #44

Signed-off-by: Dhammika Pathirana <dhammika@gmail.com>


Closes #44 

Docker-DCO-1.1-Signed-off-by: Dhammika Pathirana <dhammika@gmail.com> (github: dhammika)
nit: Can we check for EAFNOSUPPORT to make sure this was an ipv6 issue?