qemu-img: pass current cmd info into command handlers This info will be used to generate --help output. Signed-off-by: Michael Tokarev <mjt@tls.msk.ru> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20250531171609.197078-5-mjt@tls.msk.ru> Signed-off-by: Kevin Wolf <kwolf@redhat.com>