[Bug 289398] adduser(8) fails to handle short passwords for ZFS native-encryption home directories

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289398

            Bug ID: 289398
           Summary: adduser(8) fails to handle short passwords for ZFS
                    native-encryption home directories
           Product: Base System
           Version: 15.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: editor@callfortesting.org

ZFS native-encryption has an eight character minimum keyphrase length
requirement and adduser(8) does not validate this requirement before it is too
late, nor does it give a second chance, as zfs(8) does:

...
Enter encryption keyphrase for ZFS dataset (zroot/home/testuser):
Enter new passphrase:
<User enters 'test'>
cannot create 'zroot/home/testuser': Passphrase too short (min 8).
<zfs(8) retries here, adduser(8) does not, nor does it validate>
adduser: ERROR: There was an error creating ZFS dataset (zroot/home/testuser).
adduser: INFO: Successfully added (testuser) to the user database.
Failed to open dataset: zroot/home/testuser
adduser: ERROR: There was an error setting permissions on ZFS dataset
(zroot/home/testuser).
umount: /home/testuser: not a file system root directory
cannot open 'zroot/home/testuser': dataset does not exist

Tested on 15.0-ALPHA1

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