fix all vulnerabilities in the production code (#817)

Signed-off-by: Denis barbaron <denis.barbaron@orange.com>

lib/units/storage/s3.js

@@ -8,7 +8,6 @@ var path = require('path')
 var fs = require('fs')
 
 var express = require('express')
-var validator = require('express-validator')
 var bodyParser = require('body-parser')
 var formidable = require('formidable')
 var Promise = require('bluebird')
@@ -34,7 +33,6 @@ module.exports = function(options) {
   app.set('trust proxy', true)
 
   app.use(bodyParser.json())
-  app.use(validator())
 
   app.disable('x-powered-by')