225: add additional fiemap-tester run without sync

225: add additional fiemap-tester run without sync

Chris Mason pointed out that some filesystems were not doing
the right thing on fiemap, in the face of delalloc extents.

Because test 225 ran with FIEMAP_FLAG_SYNC only, this didn't
get caught.  Add a runtime option, and run it both ways.

Note that this changes defaults for fiemap-tester, so that
it no longer calls with FIEMAP_FLAG_SYNC by default, and
a new option -S is added to do so.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Alex Elder <aelder@sgi.com>