pull-nbd-2019-02-04

nbd patches for 2019-02-04

- deprecate 'qemu-nbd --partition'
- preparation for NBD reconnect, including better logging of read errors
-----BEGIN PGP SIGNATURE-----

iQEcBAABCAAGBQJcWQggAAoJEKeha0olJ0NqC70H/2hH64TdfVQzEviOjCfB/8cD
srM0M98dZyy/r5M0lA289z5edgEgURMX2dPR4U/LeKXvQGNWkLjIUTxeM9Wh/znS
yIlGhvbl3CH4i6QHh0ZOTo3l5FSqaTag+YoLQEEeSRGHXKPnlfZ28kudazJgTsvw
82TaCZqZsWLXEk02PsViVb0rCMF4D3CEjJL4yCI9M0NAu9YgLD+4lsqCE72N3QfN
4tIgg7nSo5HgbIsAcBcJXOomc9dxi9XZzVDb2GTvsf0N019GuGXmWHh32xvZohhh
IuYe2B4M+FvooTbDEPXoeTe40XQC6wk5zLeRHcN7I/NF9zW6paxIpSK5on+D+Ag=
=YUga
-----END PGP SIGNATURE-----