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Now that the Linux packages are going to be built on all of the linux
CQ bots, we shouldn't spam the console with miscellaneous info.  This
CL guards all of the logging behing the VERBOSE flag, but still prints
command stdout and stderr when the return code is nonzero.

BUG=758654
R=thestig@chromium.org

Change-Id: Ia037371b836cbf059d37131a602037c5b972c182
Reviewed-on: https://chromium-review.googlesource.com/656566Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501520}