fix default connections-per-host again; it was defined in two places. Add

fix default connections-per-host again; it was defined in two places. Add

	* libsoup/soup-session.c: fix default connections-per-host again;
	it was defined in two places. Add SOUP_SESSION_USER_AGENT property
	(setup_message): set the User-Agent request header on the request

	* libsoup/soup-server.c: add SOUP_SERVER_SERVER_HEADER property
	(start_request): set the Server response header on the request.

	* tests/get.c:
	* tests/simple-httpd.c: set the User-Agent/Server headers

svn path=/trunk/; revision=1071