skylab_test_runner: add a field for prejob deadline

We want to have a global deadline on these, since provision tasks
sometimes just get stuck.

I initially had this as a proto Duration type, but that was going to be
uglier in infra/config, where we'd need to construct one of those via
python dicts.

BUG=chromium:972660
TEST=regen

Change-Id: I465965c395c3f66a1e24cf582d9ce60ee23ed3e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2318058
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
2 files changed