Added verifications, whether tuned cpu supports scaling.
Previous governor settings are saved and reverted separately for each
CPU.
If 'cpuspeed' is installed, CPU governor is set by changing it's
settings. If not, governor is set directly through sysfs and a message
suggesting installation of 'cpuspeed' is shown.
Updated profiles:
- laptop-batery-powersave
- latency-performance
- throughput-performance
