xfstests: add regression test for kernel bz 60673 V2

xfstests: add regression test for kernel bz 60673 V2

There was a problem with send trying to overwrite a file that wasn't actually
the same.  This is a test to check this particular case where receive fails when
it should succeed properly.  I tested this to verify it fails without my fix and
passes with my fix.

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>