[Bug 229595] zpool upgrade should substitute disk and partition numbers in gpart instructions

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229595

            Bug ID: 229595
           Summary: zpool upgrade should substitute disk and partition
                    numbers in gpart instructions
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: mqudsi at neosmart.net

After upgrading a zpool with `zpool upgrade xxx`, instructions are emitted
regarding updating the bootsector code for compatibility with the latest zfs
version. These instructions emit an example of what command should be executed.


```
mqudsi at freebsd ~> sudo zpool upgrade zroot
This system supports ZFS pool feature flags.

Enabled the following features on 'zroot':
  device_removal
  obsolete_counts
  zpool_checkpoint

If you boot from pool 'zroot', don't forget to update boot code.
Assuming you use GPT partitioning and da0 is your boot disk
the following command will do it:

        gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0
```

Again, the command displayed is only an example and not to be taken/executed
literally.

As the relevant information is available to the tools in question, the actual
command to be executed should be displayed instead of a "rough estimate" of
command with the possibly incorrect disk/partition values.

See also #229594

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