xfstests: remove fio config files after finished test

After finished test, temporarily fio config file should be removed.
This commit tries to fix this problem in the following test cases:
  - generic/299-300
  - ext4/301-304
  - shared/305

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Rich Johnston <rjohnston@sgi.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>

tests/generic/300

@@ -30,6 +30,7 @@ echo "QA output created by $seq"
 
 here=`pwd`
 tmp=/tmp/$$
+fio_config=$tmp.fio
 status=1	# failure is the default!
 trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
 
@@ -51,7 +52,7 @@ then
 fi
 FS_SIZE=$((BLK_DEV_SIZE * 512))
 
-cat >$tmp-$seq.fio <<EOF
+cat >$fio_config <<EOF
 ###########
 # $seq test fio activity
 # Run DIO, fallocate and punch_hole threads on a single in parallel
@@ -128,11 +129,11 @@ _workout()
 	echo ""
 	echo "Run fio with random aio-dio pattern"
 	echo ""
-	cat $tmp-$seq.fio >>  $seqres.full
-	run_check $FIO_PROG $tmp-$seq.fio
+	cat $fio_config >>  $seqres.full
+	run_check $FIO_PROG $fio_config
 }
 
-_require_fio $tmp-$seq.fio
+_require_fio $fio_config
 
 _scratch_mkfs_sized $FS_SIZE >> $seqres.full 2>&1
 _scratch_mount