ReviewBoardServer performs several actions as part of its

initialization:

URL normalization and parsing
Cookie loading and setting
Setting a default agent
Configuring authentication
Configuring SSL
Setting HTTP handlers
Adding headers

A lot of this code was scattered, disorganized. This change attempts to

organize this and document the sections to help keep things clean. It

also removes redundant attribute acceses and updates some code for

readability.
One notable change is that the URL parsing and normalization has largely

moved to a new _normalize_url_parts() method, which has also been

expanded for some upcoming needs for strict domain cookies.

Unit tests passed.
Successfully posted this change for review.