Add validation for shielded cos + containerd 1.2 + k8s 1.13.
Add validation for shielded cos + containerd 1.2 + k8s 1.13.

Signed-off-by: Lantao Liu <e12a959b3f33bba53f1a03da59760f37bd7265d7@google.com>

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid