tmpfiles: open directories with O_NOATIME to preserve timestamp
Before:
# stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
Access: 2012-04-11 21:32:48.
444920237 +0200
# systemd-tmpfiles --clean
# stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
Access: 2012-04-11 21:36:27.
628925459 +0200
After:
# stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
Access: 2012-04-11 21:32:48.
444920237 +0200
# ./systemd-tmpfiles --clean
# stat /tmp/pulse-Du5ectm60QYM | grep 'Access: 20'
Access: 2012-04-11 21:32:48.
444920237 +0200
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=810257