Patch future systemd Apache to depend on openafs-client and crond

[ezyang]

When Apache is truly systemd'ified, we will be able to add the following:

For OpenAFS:

[Unit]
Before=httpd.service
[Install]
WantedBy=httpd.service

For Cron (needs a new patch):

[Unit]
Before=httpd.service
[Install]
WantedBy=httpd.service

Though, honestly, it may make more sense to roll our own Systemd service for afsagent.