Merge branch 'hv_netvsc-Fix-shutdown-issues-on-older-Windows-hosts'

Mohammed Gamal says:

====================
hv_netvsc: Fix shutdown issues on older Windows hosts

Guests running on WS2012 hosts would not shutdown when changing network
interface setting (e.g. Number of channels, MTU ... etc).

This patch series addresses these shutdown issues we enecountered with WS2012
hosts. It's essentialy a rework of the series sent in
https://lkml.org/lkml/2018/1/23/111

 on top of latest upstream
====================

Fixes: 0ef58b0a ("hv_netvsc: change GPAD teardown order on older versions")
Signed-off-by: David S. Miller <davem@davemloft.net>