Switch to Isolate v2

[gollux]

I just released v2.0 of Isolate, which is based on CGroup v2 and seamlessly compatible with systemd. Therefore it runs on current Linux distributions without need of adding obscure kernel switches.

Could you please update CMS to use it?

Little changes are needed, perhaps only not giving the --cg-timing switch, which is no longer supported. This timing mode was made default a long time ago and it is the only timing mode supported by Isolate v2.