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When running battor_agent.exe for the first time one is likely to
encounter the message "Unable to find a BattOr." Once a BattOr is found
and battor_agent starts running there is a more informative help message
printed if you type <enter>, but that is too late. This change prints an
informative help message when a BattOr cannot be found, and also adds a
bug link to the code to explain why BattOrs are not auto-found on
Windows.

BUG=588244

Change-Id: I1206f906b32c2f2e6ec18517e6c184aaf44bb7a7
Reviewed-on: https://chromium-review.googlesource.com/598657Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491779}