Refactor backend/index.js to remove unused code

Author: cai.li

backend/index.js

@@ -8,18 +8,15 @@ async function appStart () {
 	const app                 = require('./app');
 	const apiValidator        = require('./lib/validator/api');
 	const internalCertificate = require('./internal/certificate');
-	const internalIpRanges    = require('./internal/ip_ranges');
 
 	return migrate.latest()
 		.then(setup)
 		.then(() => {
 			return apiValidator.loadSchemas;
 		})
-		.then(internalIpRanges.fetch)
 		.then(() => {
 
 			internalCertificate.initTimer();
-			internalIpRanges.initTimer();
 
 			const server = app.listen(3000, () => {
 				logger.info('Backend PID ' + process.pid + ' listening on port 3000 ...');