The following tests are not tagged because they are not really run in
node e2e suites:
* A subset of host path tests that required SSH access
- should evaluate whether the tests should be moved to test/e2e_node
* GCP volume tests
- should evaluate whether these tests should be moved out of the
common directly since they are not shared with the node e2e suite.
Add a feature gate ReadOnlyAPIDataVolumes to a provide a way to
disable the new behavior in 1.10, but for 1.11, the new
behavior will become non-optional.
Also, update E2E tests for downwardAPI and projected volumes
to mount the volumes somewhere other than /etc.
The mounttest container should be running until the test determines to
give up (i.e., time out) and kill it. It should not exit prematurely by
itself. Bump the `--retry-timeout` to a much higher value.
