[Bug 271113] [zfs][loader] it should be possible to see zpool devices found for loader mountroot stage

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271113

            Bug ID: 271113
           Summary: [zfs][loader] it should be possible to see zpool
                    devices found for loader mountroot stage
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dch@freebsd.org

If the boot zpool fails to mount early one, this is painful to
diagnose, mostly yielding "Error 6" and not much else for a user
to deal with.

An off-by-default loader tunable that spits out device tasting
and zpools it locates would help a lot.

No particular reason for it being off-by-default other than on
large multi-device pools it could slow down boot a lot if we
print out all the things.

Specific problem encountered was a zpool where there were
traces of a previous zpool on /dev/da0 & /dev/da1 even
though the current pool was /dev/da0p3 /devda1p3 both called
zroot, and zfs 13.2-RELEASE loader could not decide which
one to import.

Displaying enumerating each label, pool guid, hostid, hostname,
for each device found would be very very useful.

zfs: /dev/da1   label2 pool_guid: 1234 hostid: 6788 hostname: 'example.org'
zfs: /dev/da1p3 label0 pool_guid: 2345 hostid: 7890 hostname: 'example.net'

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