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In VerifyEndpoint(), the code that catches an exception tries to
continue, only to hit an UnboundLocalError. Instead of doing that, raise
an SystemExit to fail gracefully.

Change-Id: Idf1174ef01fbe7a086712fa6e7b9cca7ada97a69
Reviewed-on: https://chromium-review.googlesource.com/c/1313561Reviewed-by: Steve Kobes <skobes@chromium.org>
Reviewed-by: Prasad Vuppalapu <prasadv@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606947}