Automatic merge from submit-queue (batch tested with PRs 35782, 35831, 39279, 40853, 40867)
Test GCE PD unmounts and detaches when the namespace of the pvc&pod is deleted.
Addition to Persistent Volume E2E testing. On a GCE cluster, create a pv, pvc, and client pod. Delete the namespace and check that the disk detaches successfully.
@jeffvance
~~DEPENDENT ON~~ #34353 merged. No dependencies.