LP88653 force SSL for requests from local XUL

LP88653 force SSL for requests from local XUL

Modifies RemoteRequest.js to convert any http:// request URL to https:// if the
requesting location has a chrome:// protocol.

Modifies util/network.js such that any use of util.network.request (as opposed
to util.network.simple_request) will assume "secure" for the resulting request.

Adds an example to the bottom of eg_vhost.conf for forcing SSL for an entire
site (OPAC and everything), courtesy of Dan Wells.

Signed-off-by: Jason Etheridge <jason@esilibrary.com>