util-linux: port swapfile init scripts to systemd

Signed-off-by: Stephan Raue <stephan@openelec.tv>
busybox: rework and enable /var/log relink to persistent store logfiles on /storage

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: dont load coretemp as module (included in kernel)

Signed-off-by: Stephan Raue <stephan@openelec.tv>