kernel: Change /proc group to gid 10 (=wheel).

kernel: Change /proc group to gid 10 (=wheel).

grsecurity provides a feature to restrict access to /proc. In our
particular setting, nobody than root is allow to access all of the
/proc fs, but as we need some processes to get access to it as well
(snmpd, radvd, ...) we need a group to allow that.

I have choosen "wheel" as it is recommended by spengler.