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The servers are picked using the same command line switch that we use
to pick PCAs.

BUG=b:69687094
TEST=None

Change-Id: Ia1c79fda63e2d3d07b44da1ce814974d56d6726d
Reviewed-on: https://chromium-review.googlesource.com/795187
Commit-Queue: Yves Arrouye <drcrash@chromium.org>
Reviewed-by: Darren Krahn <dkrahn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524401}