Add inhibit job for cros-disks in test image We want auto-mount disabled in factory test image so that it will not confuse our test programs. BUG=chrome-os-partner:24798 TEST=Boot factory test image and verify cros-disks is inhibited. Change-Id: Iebcffab66e0a0f568f8cdef84cfbe5ad80c574bc Reviewed-on: https://chromium-review.googlesource.com/206628 Reviewed-by: Vic Yang <[email protected]> Reviewed-by: Hung-Te Lin <[email protected]> Reviewed-by: Ben Chan <[email protected]> Commit-Queue: Ricky Liang <[email protected]> Tested-by: Ricky Liang <[email protected]>