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This allows for temporarily stopping the network so that
update engine tasks can be deterministically cancelled in a unit test.

Bug: 822990
Change-Id: I8d9cf5676c2f1d3211fe392e130eb48052307605
Reviewed-on: https://chromium-review.googlesource.com/998737Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548592}