arcstat: Add -a and -p options from FreeNAS

[ghost]

Added -a option to automatically print all valid statistics.
Added -p option to suppress scaling of printed data.

Authored by: Nick Principe [email protected]
Ported-by: Ryan Moeller [email protected]
Signed-off-by: Ryan Moeller [email protected]

Motivation and Context

Description

How Has This Been Tested?

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 OpenZFS 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]

Codecov Report

Merging #11090 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11090      +/-   ##
==========================================
+ Coverage   79.72%   79.77%   +0.04%     
==========================================
  Files         397      397              
  Lines      125759   125759              
==========================================
+ Hits       100266   100321      +55     
+ Misses      25493    25438      -55     

Flag	Coverage Δ
#kernel	80.42% <ø> (+0.01%)	⬆️
#user	65.82% <ø> (+0.47%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/zvol_id/zvol_id_main.c	76.31% <0.00%> (-5.27%)	⬇️
module/zfs/vdev_raidz.c	89.03% <0.00%> (-2.39%)	⬇️
cmd/zdb/zdb.c	80.50% <0.00%> (-1.15%)	⬇️
module/zfs/spa_log_spacemap.c	93.40% <0.00%> (-1.15%)	⬇️
module/os/linux/zfs/zfs_file_os.c	84.15% <0.00%> (-1.00%)	⬇️
module/zfs/vdev_initialize.c	97.15% <0.00%> (-0.95%)	⬇️
module/zfs/vdev_indirect.c	73.75% <0.00%> (-0.84%)	⬇️
module/zfs/vdev_trim.c	95.35% <0.00%> (-0.75%)	⬇️
lib/libzutil/os/linux/zutil_import_os.c	80.06% <0.00%> (-0.67%)	⬇️
module/icp/api/kcf_mac.c	38.85% <0.00%> (-0.58%)	⬇️
... and 44 more

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