Set kernel.core_pattern in sysctl/sp-rich-core.conf

systemd set the pattern too late and thus some crashes early after boot
weren't caught.

rich-core-pattern.service now solely triggers creation of reports after
HW reboots and later is going to be renamed.
Merge pull request #39 from xhaakon/master

Set kernel.core_pattern in sysctl/sp-rich-core.conf