Automatic merge from submit-queue
Always skew the client when running version-skew tests
As mentioned in the comments:
- for upgrade jobs, we want kubectl to be at the same version as master.
- for client skew tests, we want to use the skewed kubectl (that's what we're testing).
So, remove gate on `JENKINS_USE_SKEW_KUBECTL`, and always use the skewed `kubectl`.
This should go in before https://github.com/kubernetes/test-infra/pull/109.
72b1be9c76