ZED: Match added disk by pool/vdev GUID if found

[ghost]

Motivation and Context

ZED currently can only auto-online/replace disks that are wholedisk managed by ZFS. It matches either devid or phys_path, neither of which are retained in the pool config unless the vdev was a wholedisk.

Description

Add another fallback matching by pool/vdev GUID.
Log the is_part field in the event to ease future debugging.

How Has This Been Tested?

I added a test to ZTS for partitioned vdev auto-online using scsi_debug. I've also manually tested this with physical hardware by pulling a drive from a mirror and reinserting it. The pool was degraded and then the device was brought back online by zed as expected.

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.

[ghost]

Looks like I need to add an exception to zts-report.py to allow the github test runners to SKIP the test.

[behlendorf]

Looks through the test results again it looks like the new test is reliably failing on CentOS 7. It's probably an issue with the test case and this old environment, but we'll need to sort it out before merging this.

[ghost]

Rebased and added block_device_wait before creating the pool to make sure the partition has appeared in /dev.