Convert *-skew upgrade tests to use e2e scenario (#1825)
Convert *-skew upgrade tests to use e2e scenario (#1825)


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