virtio 1.1 drivers

These drivers are supplementary to support virtio 1.1 new feature on CentOS 7.6, CentOS 7.9, Ubuntu 16.04, Ubuntu 18.04 and Debian 10.

Build package:

./mkpkg.sh

Installation:

1. Centos 7.x:

   rpm -ivh release/virtio_centos-7.6-7.7-v11.noarch.rpm
   or
   rpm -ivh release/virtio_centos-7.8-7.9-v11.noarch.rpm

2. Ubuntu 16.04 (kernel-4.4 or kernel-4.18):

   tar xvf release/virtio_ubuntu-16.04-kernel-4.18/4.4-v11.tar; cd virtio_ubuntu-16.04-kernel-4.18/4.4-v11; ./install.sh

3. Ubuntu 18.04:

   tar xvf release/virtio_ubuntu-18.04-v11.tar; cd virtio_ubuntu-18.04-v11; ./install.sh

4. Debian 10:

   dpkg -i release/virtio-dkms_1.1.0_amd64.deb