[Cooker] rename cron files

[Sebastian Dransfeld]

Rename these files:

>From man-1.5h1-10mdk:
/etc/cron.daily/makewhatis.cron -> /etc/cron.daily/makewhatis
>From slocate-2.5-5mdk:
/etc/cron.daily/slocate.cron -> /etc/cron.daily/slocate

Else run-parts doesn't run these scripts.

Or make . a valid character in a filename.

seb