Add helper function to fix number problems

As minio causes various problem if you configure it using environment
variables and leave the port setting out, which will evaluate to NaN,
this change should fix this in a clean way for this time and helps to
support numbers in general in future.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/config/environment.js

@@ -1,11 +1,11 @@
 'use strict'
 
-const {toBooleanConfig, toArrayConfig} = require('./utils')
+const {toBooleanConfig, toArrayConfig, toIntegerConfig} = require('./utils')
 
 module.exports = {
   domain: process.env.HMD_DOMAIN,
   urlpath: process.env.HMD_URL_PATH,
-  port: process.env.HMD_PORT,
+  port: toIntegerConfig(process.env.HMD_PORT),
   urladdport: toBooleanConfig(process.env.HMD_URL_ADDPORT),
   usessl: toBooleanConfig(process.env.HMD_USESSL),
   hsts: {
@@ -40,7 +40,7 @@ module.exports = {
     secretKey: process.env.HMD_MINIO_SECRET_KEY,
     endPoint: process.env.HMD_MINIO_ENDPOINT,
     secure: toBooleanConfig(process.env.HMD_MINIO_SECURE),
-    port: parseInt(process.env.HMD_MINIO_PORT)
+    port: toIntegerConfig(process.env.HMD_MINIO_PORT)
   },
   s3bucket: process.env.HMD_S3_BUCKET,
   facebook: {