Move module object inside MODULE_INFO

This allows modules to only expose one entry point with a consistent
signature. In the future, this could be used to implement declarations of
module parameters.

include/maxscale/dcb.h

@@ -326,7 +326,7 @@ typedef enum
 void dcb_global_init();
 
 int dcb_write(DCB *, GWBUF *);
-DCB *dcb_accept(DCB *listener, GWPROTOCOL *protocol_funcs);
+DCB *dcb_accept(DCB *listener);
 DCB *dcb_alloc(dcb_role_t, struct servlistener *);
 void dcb_free(DCB *);
 void dcb_free_all_memory(DCB *dcb);