conformance tests fail on 1.12 clusters

[jackfrancis]

There are some new test behaviors in 1.12 vs 1.11 for validating that all nodes are schuedulable.

Here is the 1.12 test:

https://github.com/kubernetes/kubernetes/blob/v1.12.0/test/e2e/framework/util.go#L2651

Here is the test as it was in 1.11:

https://github.com/kubernetes/kubernetes/blob/v1.11.0/test/e2e/framework/util.go#L2624

The OR condition below is new compared to 1.11:

if !isNodeSchedulable(node) || !isNodeUntainted(node) {

And the final argument in this function invocation is also new:

IsNodeConditionSetAsExpectedSilent(notSchedulable[i], v1.NodeNetworkUnavailable, false), notSchedulable[i].Spec.Taints)

[lachie83]

The code has started looking for the following node label node-role.kubernetes.io/master: "" on the masters before it can continue. This is new code that was introduced in 1.12.