Increase staleness period for vSphere conformance
Increase staleness period for vSphere conformance

This patch increases the periodic staleness check for vSphere e2e
conformance tests from 24 hours to 32 hours due to the current inability
to control the start time of the Travis-CI-based, daily cron job to
ensure test results no older than 24 hours.

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