Start SSL after CONNECTing! Doh. Part of bnc #174255.

Start SSL after CONNECTing! Doh. Part of bnc #174255.

	* libsoup/soup-connection.c (soup_connection_connect_sync): Start
	SSL after CONNECTing! Doh. Part of bnc #174255.
	(SoupConnectionMode): new enum for the three types of
	SoupConnection (direct, proxy, tunnel).
	(set_property): set priv->mode according to proxy_uri and
	conn_uri.
	(socket_connect_result, soup_connection_connect_sync): use
	priv->mode to decide whether or not to tunnel.
	(send_request): Only pass TRUE for is_proxy to
	soup_message_send_request if mode is PROXY, not if it's TUNNEL.
	(Also part of bnc #174255).