MXS-2011 Change return value of blr_check_connect_retry

0 cannot be used to indicate failure as 0 will be the waiting
period if we switch to an alternative server.

Also fix some minor issues; failure to initialize all members
and inverted success-check.

server/modules/routing/binlogrouter/blr_file.cc

@@ -3331,7 +3331,7 @@ int blr_file_read_master_config(ROUTER_INSTANCE *router)
 
     int rc = ini_parse(filename, blr_handler_config, router);
 
-    if (rc == 1)
+    if (rc == 0)
     {
         mxb_assert(router->configs.size() > 0);
         blr_master_set_config(router, router->configs[0]);