nbd patches for 2019-04-01
- Better behavior of qemu-img map on NBD images
- Fixes for NBD protocol alignment corner cases:
- the server has fewer places where it sends reads or block status
not aligned to its advertised block size
- the client has more cases where it can work around server
non-compliance present in qemu 3.1
- the client now avoids non-compliant requests when interoperating
with nbdkit or other servers not advertising block size
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