xfstests: remove undocumented TESTS_REMAINING_LOG

Undocumented and unused, AFAICT. Kill it.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>

check

@@ -365,17 +365,10 @@ fi
 seq="check"
 _check_test_fs
 
-[ -n "$TESTS_REMAINING_LOG" ] && echo $list > $TESTS_REMAINING_LOG
-
 for seq in $list
 do
     err=false
     echo -n "$seq"
-    if [ -n "$TESTS_REMAINING_LOG" ] ; then
-        sed -e "s/$seq//" -e 's/  / /' -e 's/^ *//' $TESTS_REMAINING_LOG > $TESTS_REMAINING_LOG.tmp
-        mv $TESTS_REMAINING_LOG.tmp $TESTS_REMAINING_LOG
-        sync
-    fi
 
     if $showme
     then