Set up logging for rb-site command

Review Request #9797 — Created March 16, 2018 and submitted — Latest diff uploaded

Information

Review Board
release-3.0.x
772a536...

Reviewers

This patch just adds a logging handler for rb-site so that, if logging
happens before we hit initialize() we get the acutal logs and don't
instead get errors about a missing logger.

Added some logging statements in main() and saw they were logged.