Add support for SNI connecting trough TLS

This will pass hostname.
This fixes #137.

You can easily verify the change with a network capture program running
something like

    remote-viewer spice+tls://www.spice-space.org:443

you will see the hostname in the initial exchange.

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Acked-by: Victor Toso <victortoso@redhat.com>
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