Disable zvol_ENOSPC_001_pos on 32-bit systems

[behlendorf]

Description

Occasionally observed failure of zvol_ENOSPC_001_pos due to the
test case taking to long to complete. Disable the test case until
it can be improved.

Motivation and Context

Issue #5848,
Disable known harmless issues which can distract from real problems.

How Has This Been Tested?

Buildbot

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.
• All new and existing tests passed.
• All commit messages are properly formatted and contain Signed-off-by.
• Change has been approved by a ZFS on Linux member.

[codecov]

Codecov Report

Merging #6862 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6862      +/-   ##
==========================================
+ Coverage   75.16%   75.19%   +0.02%     
==========================================
  Files         298      298              
  Lines       94503    94503              
==========================================
+ Hits        71032    71058      +26     
+ Misses      23471    23445      -26

Flag	Coverage Δ
#kernel	74.49% <ø> (-0.23%)	⬇️
#user	67.41% <ø> (+0.1%)	⬆️

Impacted Files	Coverage Δ
module/icp/algs/skein/skein_port.h	0% <0%> (-100%)	⬇️
module/zfs/vdev_missing.c	60% <0%> (-30%)	⬇️
module/zfs/vdev_raidz.c	95.98% <0%> (-1.73%)	⬇️
module/icp/api/kcf_cipher.c	15.35% <0%> (-0.83%)	⬇️
module/zfs/zio_inject.c	76.07% <0%> (-0.79%)	⬇️
module/zfs/dnode.c	92.63% <0%> (-0.63%)	⬇️
module/zfs/vdev_label.c	94.82% <0%> (-0.6%)	⬇️
lib/libzpool/kernel.c	69.51% <0%> (-0.49%)	⬇️
module/zfs/spa.c	83% <0%> (-0.43%)	⬇️
module/zfs/vdev_queue.c	96.38% <0%> (-0.37%)	⬇️
... and 36 more

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