[BUG] Implement kubelet process automated tests

[jeniawhite]

Describe the bug
Improve the testing infrastructure in order to support the restart of kubelet service via systemctl.
Implement the kubelet rules tests.

Expected behavior
Should run automated kubelet rules tests

[jeniawhite]

I've left some rule gaps due to implementation complexity/open questions

Etcd rules:
2.1 - requires certificate files (removing them or placing stubs kills the cluster)
2.4 - requires certificate files (removing them or placing stubs kills the cluster)

Kubelet rules:
4.2.8 - not configurable via the kubelet config file
4.2.9 - eventRecordQPS should be an appropriate level and rego checks only for 0
4.2.12 - first test case should fail instead of pass

[eyalkraft]

Hey Jenia, Great work!!
Could you try and estimate the required work for each one of these gaps?

This will let us prioritize them and decide if we want to put the effort into implementing those tests.