knotd: Make global query module activation occur later

This commit moves the call to conf_activate_modules() out of the
set_config() function and into main() so that global query modules are
activated after privilege dropping has occurred.

This makes the global query modules match the zone query modules a
little better. The zone query modules are activated later, after
privilege dropping has occurred.

This ensures that if a global query module launches its own threads at
startup, those threads are spawned from a main thread that has already
performed privilege dropping.

src/utils/knotd/main.c

@@ -367,10 +367,6 @@ static int set_config(const char *confdb, const char *config)
 		log_error("failed to migrate configuration (%s)", knot_strerror(ret));
 	}
 
-	/* Activate global query modules. */
-	conf_activate_modules(new_conf, NULL, new_conf->query_modules,
-	                      &new_conf->query_plan);
-
 	/* Update to the new config. */
 	conf_update(new_conf, CONF_UPD_FNONE);
 
@@ -534,6 +530,10 @@ int main(int argc, char **argv)
 		return EXIT_FAILURE;
 	}
 
+	/* Activate global query modules. */
+	conf_activate_modules(conf(), NULL, conf()->query_modules,
+	                      &conf()->query_plan);
+
 	/* Check and create PID file. */
 	long pid = (long)getpid();
 	if (daemonize) {