ACK/APPLIED: [Artful SRU] Fix reuseport regression (LP: #1722702)

[Seth Forshee]

On Mon, Oct 16, 2017 at 01:46:23PM +0200, Stefan Bader wrote:
> A regression introduced in v4.11 has recently been fixed in the
> upstream 4.14 development tree. David Miller merged those 3 changes
> together in the net tree (likely will appear on 4.13.y but better
> have them surely before moving 4.13 into Xenial as hwe-edge)

Clean cherry picks, all straightforward bug fixes.

Acked-by: Seth Forshee <seth.forshee at canonical.com>

Applied to artful/master-next, thanks!