Description of problem: Tests have begun failing shortly after the 1.13 rebase landed: https://openshift-gce-devel.appspot.com/build/origin-ci-test/logs/release-openshift-origin-installer-e2e-aws-4.0/6398#openshift-tests-sig-storage-in-tree-volumes-driver-nfs-testpattern-pre-provisioned-pv-block-volmode-volumemode-should-fail-to-create-pod-by-failing-to-mount-volume-suiteopenshiftconformanceparallel-suitek8s https://openshift-gce-devel.appspot.com/build/origin-ci-test/logs/release-openshift-origin-installer-e2e-aws-4.0/6398#openshift-tests-sig-storage-in-tree-volumes-driver-aws-testpattern-dynamic-pv-block-volmode-volumemode-should-create-sc-pod-pv-and-pvc-readwrite-to-the-pv-and-delete-all-created-resources-suiteopenshiftconformanceparallel-suitek8s
These tests need kubelet 1.13 which has BlockVolume enabled by default. It is expected that they fail for kubelet 1.12. However, the way these tests failed is unexpected: there is issue with version-skewed clusters that I thought couldn't happen, I will be opening an upstream issue for that.
IMO, all tests that were disabled during 1.13 rebase are fixed / enabled now.