The documentation for novncproxy_base_url says:
If using noVNC >= 1.0.0, you should use ``vnc_lite.html`` instead of
``vnc_auto.html``.
While novnc packages in CentOS, Debian, and Ubuntu still provide
vnc_auto.html for compatibility, this could be dropped in the future.
Change-Id: I04883c877015c1835c8b6b2c8be1fb7156ceb340