scylla_cpuscaling_setup: disable ondemand.service on Ubuntu
scylla_cpuscaling_setup: disable ondemand.service on Ubuntu

On Ubuntu, scaling_governor becomes powersave after rebooted, even we configured cpufrequtils.
This is because ondemand.service, it unconditionally change scaling_governor to ondemand or powersave.
cpufrequtils will start before ondemand.service, scaling_governor overwrite by ondemand.service.
To configure scaling_governor correctly, we have to disable this service.

Fixes #9324

Closes #9325

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla