This increases the timeout of the document validation job from
30min (default) to 60min. This is required because of the recent
addition of provider-specific site definitions; since a kind cluster
is set up / torn down for each site definition, it can take longer
than a half hour when running on slower open infra VMs.
Change-Id: I23e7201365058d96ccdc07e310c3c921daf952a7
f164c97e6a