Split the service header into internal and external parts

The service header in include/maxscale/ contains the public part of the
service API. These functions can be safely used by the modules.

The internal header located in service/core/maxscale/ is used by the core
to initialize MaxScale at startup or to provide other services in a more
controlled way (the config_runtime, for example).

server/modules/routing/binlog/test/testbinlog.c

@@ -26,7 +26,6 @@
 #include <string.h>
 #include <ctype.h>
 #include <time.h>
-#include <maxscale/service.h>
 #include <maxscale/server.h>
 #include <maxscale/router.h>
 #include <maxscale/atomic.h>
@@ -47,6 +46,9 @@
 
 #include <maxscale/version.h>
 
+// This isn't really a clean way of testing
+#include "../../../../core/maxscale/service.h"
+
 static void printVersion(const char *progname);
 static void printUsage(const char *progname);
 extern int blr_test_parse_change_master_command(char *input, char *error_string, CHANGE_MASTER_OPTIONS *config);