merge master and 1.4 along with due patches to merge to 1.4

[paravmellanox]

Hi Michael,

Can you please consider this pull request as gentle request to merge the changes of master branch and following patches which are been waiting to be merged for several days, weeks and months now for various patches.
You might be busy with other projects. Here is a work to help and speed up your workflow and accept the work of the community.

I resolved the merge conflict arise due to master and 1.4 branches. They are only of the editorial nature.
I also verified the generated specification draft pdf with these changes.

The intention is not to follow any different process.
The pull request is created only as reference to speed up your merge flow.

This pull request consist of

1. merging master branch to 1.4.
   Commits 1 to 16.
2. Patches for the issue virtio-blk: Fix incorrect data type of field num_queues #195
   https://lore.kernel.org/virtio-comment/hqicqs6p5h4r4xcdhmathfiegvcaly76ityqe67erj7c4b65ck@d2n6v53is5ya/T/#m6fc5341ecf3a68b5fc63ed5cd1b231aa2fb99961
3. Patches for the issue virtio-net: Clarify the size of virtio_net_hdr for tx, rx along with receive buffer size #183
   https://lore.kernel.org/virtio-comment/[email protected]/T/#u
4. Patches for the issue virtio-net: Support packet match fields based receive packet steering/forwarding #179
   https://lore.kernel.org/virtio-comment/[email protected]/T/#t
5. patches for issue Support device state handling for PCI VFs #176
   https://lore.kernel.org/virtio-comment/[email protected]/T/#u
6. patches for the issue virtio_pci_cap64: specify offset_hi, length_hi endianness #196
   https://lore.kernel.org/virtio-comment/PH0PR12MB5481A6C266BD5303B98AF5EEDCC72@PH0PR12MB5481.namprd12.prod.outlook.com/T/#m6d45232211d1e1b617171189515a5e11c9b7642c