generic/042: remove from the 'auto' group

generic/042: remove from the 'auto' group

This test fails 100% of the time for me on xfs and current git head, and
is not run for ext4 since ext4 does not support shutdown.  After talking
with bfoster, it isn't expected to succeed right now.  Since the auto
group is for tests that *are* expected to succeed, let's move this one
out.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>