ZTS: Move largest_pool_001_pos.ksh to Linux runfile

[behlendorf]

Motivation and Context

Observed CI failures:

http://build.zfsonlinux.org/builders/FreeBSD%20main%20amd64%20%28TEST%29/builds/3051/steps/shell_4/logs/summary

Description

On FreeBSD pools are not allowed to be created using vdevs which are
backed by ZFS volumes. This configuration is not recommended for any
supported platform, nevertheless the largest_pool_001_pos.ksh test
case makes use of it as a convenience. This causes the test case to
fail reliably on FreeBSD. The layout is still tolerated on Linux
so only perform this test on Linux.

Alternately there is an option for FreeBSD which can be set to allow this.
However, since it's not used anywhere else in the test suite I opted to
keep it that way for now.

How Has This Been Tested?

Pending CI results.

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)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• 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.

[ikozhukhov]

it is work on dilos too :)
Test: /opt/zfs-tests/tests/functional/largest_pool/largest_pool_001_pos (run as root) [02:15] [PASS]
but have to upstream dilos updates to shared code first as additional platform :)

[behlendorf]

The vfs.zfs.vol.recursivesysctl tunable can be used on FreeBSD to enable this as well, so we could always move this back to a common test if we choose to go that route.