check: allow comments in exclude files

Sometimes it's useful to keep track of why we're excluding a particular
test. Technically, we can include whatever explanation we want in the
exclude file since we just grep for the test names, but properly
supporting comments is a little more robust. This patch makes it so that
the rest of a line after a '#' is ignored.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

check

@@ -224,14 +224,14 @@ while [ $# -gt 0 ]; do
 	-X)	xfile=$2; shift ;
 		for d in $SRC_GROUPS $FSTYP; do
 			[ -f $SRC_DIR/$d/$xfile ] || continue
-			for f in `cat $SRC_DIR/$d/$xfile`; do
+			for f in `sed "s/#.*$//" $SRC_DIR/$d/$xfile`; do
 				echo $d/$f >> $tmp.xlist
 			done
 		done
 		;;
 	-E)	xfile=$2; shift ;
 		if [ -f $xfile ]; then
-			cat "$xfile" >> $tmp.xlist
+			sed "s/#.*$//" "$xfile" >> $tmp.xlist
 	        fi
 		;;
 	-s)	RUN_SECTION="$RUN_SECTION $2"; shift ;;