Proxy protocol moves tolog transport

[bazsi]

This is now a complete LogTransport based implementation of the HAProxy protocol so it applies cleanly to any kind of LogProto implementation.

[alltilla]

style check fails on this:

--- a/modules/afsocket/transport-mapper-inet.c
+++ b/modules/afsocket/transport-mapper-inet.c
@@ -91,8 +91,8 @@ _setup_socket_transport(TransportMapperInet *self, LogTransportStack *stack)
 {
   log_transport_stack_add_transport(stack, LOG_TRANSPORT_SOCKET,
                                     self->super.sock_type == SOCK_DGRAM
-                                           ? log_transport_udp_socket_new(stack->fd)
-                                           : log_transport_stream_socket_new(stack->fd));
+                                    ? log_transport_udp_socket_new(stack->fd)
+                                    : log_transport_stream_socket_new(stack->fd));
   return TRUE;
 }

[bazsi]

I've fixed up the outstanding review notes and made sure the CI is green.