This change updated several of the Chromoting Test Driver classes to use
URLs and settings which are needed to retrieve and connect to hosts
running in our test environment.

There are also two changes (null check and initializing the FeatureList)
which are needed for the tool to run (external dependencies changed but
the tool hasn't been updated yet).

BUG=N/A

Review-Url: https://codereview.chromium.org/2542343004
Cr-Commit-Position: refs/heads/master@{#436020}