[Bug 256024] [zfs] `zpool upgrade' doesn't warn about updating bootloader anymore

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256024

            Bug ID: 256024
           Summary: [zfs] `zpool upgrade' doesn't warn about updating
                    bootloader anymore
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: grembo@FreeBSD.org

It seems like that while switching our upstream to OpenZFS, the following
warning was lost after upgrading a zpool (e.g., `zpool upgrade zroot`):

  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


I always liked that warning, as it reminded me not to forget this important
step. At the same time I was also not so happy about the hardcoded example it
gives (it only covers one specific setup).

Therefore I would propose to get this feature back, but using a more generic
text:

  In case you're booting from <poolname>, please make sure to update
  the bootcode according to your partition layout.
  See zfsboot(8) (`man zfsboot') for details.


I didn't create a patch/code review yet, as I'm not sure how processes work
when changing ZFS related code. I assume we try to keep the delta with OpenZFS
as small as possible.

This would also address bug #229595.

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