In my environment we are using a feature of Perforce which allows you to
redirect all requests through a remote server and also utilizing an
authorization key.  This causes the P4PORT setting to be different for
everyone and thus making it not match the repository-path on the
review-board server. This change allows for the rbtools to utilize a
repository-id in the new review request post call. The repository-id is
already supported by review-board.

Tested by created a new review request in my environment.