Add netlink hooks to delete a bridge dev

Signed-off-by: Dhammika Pathirana <dhammika@gmail.com>

Docker-DCO-1.1-Signed-off-by: Dhammika Pathirana <dhammika@gmail.com> (github: dhammika)
Add code review updates

Docker-DCO-1.1-Signed-off-by: Dhammika Pathirana <dhammika@gmail.com> (github: dhammika)
Merge pull request #46 from dhammika/44-delete-bridge

Add netlink hooks to delete a bridge dev #44