doveadm: Give a better error message if we can guess that unknown command is due to unloaded plugin.
doveadm: Give a better error message if we can guess that unknown command is due to unloaded plugin.

jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot