Split config.h into external and internal parts

The external config.h header defined functions and structures that are
intended to be used by modules. The internal header contains functions
that are used only by the MaxScale core.

server/core/config.c

@@ -66,6 +66,7 @@
 #include <maxscale/utils.h>
 #include <maxscale/gwdirs.h>
 
+#include "maxscale/config.h"
 #include "maxscale/filter.h"
 #include "maxscale/service.h"
 
@@ -718,8 +719,7 @@ config_load(const char *filename)
  *
  * @return True on success, false on fatal error.
  */
-bool
-config_reload()
+bool config_reload()
 {
     bool rval = false;
 
@@ -2305,11 +2305,6 @@ bool config_append_param(CONFIG_CONTEXT* obj, const char* key, const char* value
     return rval;
 }
 
-/**
- * Return the pointer to the global options for MaxScale.
- * @return Pointer to the GATEWAY_CONF structure. This is a static structure and
- * should not be modified.
- */
 GATEWAY_CONF* config_get_global_options()
 {
     return &gateway;