Log: skygw_log_flush replaced with mxs_log_flush.

skygw_log_flush replaced with mxs_log_flush and skygw_log_sync_all
with mxs_log_flush_sync.

server/core/maxkeys.c

@@ -56,7 +56,7 @@ int main(int argc, char **argv)
         rval = 1;
     }
 
-    skygw_log_sync_all();
+    mxs_log_flush_sync();
     mxs_log_finish();
 
     return rval;