MXS-1929: Make core ResultSet functions private

The functions in the core that generate a ResultSet are now private.

server/core/internal/modules.h

@@ -19,7 +19,6 @@
 #include <maxscale/cdefs.h>
 #include <maxscale/dcb.h>
 #include <maxscale/modinfo.h>
-#include <maxscale/resultset.h>
 #include <maxscale/debug.h>
 
 MXS_BEGIN_DECLS
@@ -85,13 +84,6 @@ void printModules();
  */
 void dprintAllModules(DCB *);
 
-/**
- * @brief Return a resultset that has the current set of modules in it
- *
- * @return A Result set
- */
-RESULTSET *moduleGetList();
-
 typedef struct mxs_module_iterator
 {
     const char* type;