ZTS: Use FreeBSD cloudinit images

[mcmilk]

FreeBSD provides CI-IMAGES since some time. These images are based on nuageinit, which does not support fqdn and sudo for example. So we need currently some workarounds to get it working.

The FreeBSD images will be more compatible with cloud-init in some near future. Then we can remove the workaround things.

These versions are used for testing:

• freebsd13-4r (RELEASE)
• freebsd14-3s (STABLE)
• freebsd15-0c (CURRENT)

Motivation and Context

Remove dependency to my extra repository with cloud-init enabled FreeBSD images.

Description

The CI Images of FreeBSD are based on nuageinit which only provide some subset of all the cloud-init configurations.

@bapt told me, that sudo and other smaller features which we require will get supported in some near future.

How Has This Been Tested?

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Performance enhancement (non-breaking change which improves efficiency)
• [x] Code cleanup (non-breaking change which makes code smaller or more readable)
• [x] Quality assurance (non-breaking change which makes the code more robust against bugs)
• [ ] 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:

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