The test "A node shouldn't be able to create another node" could create
a node during its run, but it doesn't delete it in this case.
This commit addresses this issue.
This is part of the transition to using framework/log instead
of the Logf inside the framework package. This will help with
import size/cycles when importing the framework or subpackages.
This PR makes the node authorizer automatically set up access rules for
dynamic Kubelet config.
I also added some validation to the node strategy, which I discovered we
were missing while writing this.
