[Minor] Change deinit order

some destructors in Lua could require Redis pool, that is why the pool should be shud down after lua_state.
While redis pool is created in the mempool.

src/libserver/cfg_utils.c

@@ -232,11 +232,6 @@ rspamd_config_free (struct rspamd_config *cfg)
 	g_list_free (cfg->classifiers);
 	g_list_free (cfg->workers);
 	rspamd_symbols_cache_destroy (cfg->cache);
-#ifdef WITH_HIREDIS
-	if (cfg->redis_pool) {
-		rspamd_redis_pool_destroy (cfg->redis_pool);
-	}
-#endif
 	ucl_object_unref (cfg->rcl_obj);
 	ucl_object_unref (cfg->config_comments);
 	ucl_object_unref (cfg->doc_strings);
@@ -257,13 +252,21 @@ rspamd_config_free (struct rspamd_config *cfg)
 
 	rspamd_re_cache_unref (cfg->re_cache);
 	rspamd_upstreams_library_unref (cfg->ups_ctx);
-	rspamd_mempool_delete (cfg->cfg_pool);
 	g_ptr_array_free (cfg->c_modules, TRUE);
 
 	if (cfg->lua_state && cfg->own_lua_state) {
 		lua_thread_pool_free (cfg->lua_thread_pool);
 		lua_close (cfg->lua_state);
 	}
+
+#ifdef WITH_HIREDIS
+	if (cfg->redis_pool) {
+		rspamd_redis_pool_destroy (cfg->redis_pool);
+	}
+#endif
+
+	rspamd_mempool_delete (cfg->cfg_pool);
+
 	REF_RELEASE (cfg->libs_ctx);
 
 	DL_FOREACH_SAFE (cfg->log_pipes, lp, ltmp) {