add a "timeout" property, which gets passed from server to socket, and

add a "timeout" property, which gets passed from server to socket, and

        * libsoup/soup-connection.c:
        * libsoup/soup-session.c:
        * libsoup/soup-socket.c: add a "timeout" property,
        which gets passed from server to socket, and session to connection
        to socket, allowing blocking non-responsive sync connections to
        return.  Combination of "EAGAIN" && "Blocking" connection is treated
        as error and the connection will be terminated and the control
        is returned to the caller immediately.