Better disambiguate incomplete and corrupted streams on receive

[pcd1193182]

Motivation and Context

When a stream fails to receive, it can often be difficult to know why. The displayed error message does not make it clear what caused the problem, which can make it more challenging to resolve any underlying issues.

Description

This change adds a separate return code to zfs_ioc_recv that is used for incomplete streams, in addition to the existing return code for streams that contain corruption.

How Has This Been Tested?

Created a send stream, and then two copies. One was truncated by a few kilobytes, and the other had a random byte modified.

delphix@pd-send:~$ cat stream.trunc | sudo zfs recv test/rfs
cannot receive new filesystem stream: incomplete stream
delphix@pd-send:~$ cat stream.cksum | sudo zfs recv test/rfs
cannot receive new filesystem stream: checksum mismatch
delphix@pd-send:~$ cat stream | sudo zfs recv test/rfs
delphix@pd-send:~$

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the ZFS on Linux code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[codecov-io]

Codecov Report

Merging #10122 into master will increase coverage by 29.57%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master   #10122       +/-   ##
===========================================
+ Coverage   49.72%   79.29%   +29.57%     
===========================================
  Files         324      385       +61     
  Lines       97160   122389    +25229     
===========================================
+ Hits        48309    97053    +48744     
+ Misses      48851    25336    -23515     

Flag	Coverage Δ
#kernel	79.67% <100.00%> (+73.35%)	⬆️
#user	66.42% <66.66%> (+8.51%)	⬆️

Impacted Files	Coverage Δ
lib/libzfs/libzfs_sendrecv.c	75.72% <100.00%> (ø)
module/zfs/dmu_recv.c	76.20% <100.00%> (+76.20%)	⬆️
module/zfs/space_map.c	93.31% <0.00%> (-2.48%)	⬇️
module/zfs/vdev_initialize.c	97.77% <0.00%> (-0.32%)	⬇️
module/icp/core/kcf_callprov.c	4.55% <0.00%> (-0.21%)	⬇️
module/zfs/lzjb.c	98.14% <0.00%> (ø)
lib/libuutil/uu_list.c	59.64% <0.00%> (ø)
lib/libzfs/os/linux/libzfs_util_os.c	56.92% <0.00%> (ø)
cmd/zinject/zinject.c	35.03% <0.00%> (ø)
cmd/zed/agents/zfs_agents.c	90.66% <0.00%> (ø)
... and 285 more

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