change way how we call hasOwnProperty

hapijs/hapi#3280 (comment)

Fixing:

TypeError: arguments.hasOwnProperty is not a function
    at parseAttacksArguments (/home/ogajduse/Documents/repos/dosgen/dosgen-web/routes/dosgen.js:67:23)
    at /home/ogajduse/Documents/repos/dosgen/dosgen-web/routes/dosgen.js:24:16
    at Layer.handle [as handle_request] (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/layer.js:82:5)
    at next (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/route.js:110:13)
    at Route.dispatch (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/route.js:91:3)
    at Layer.handle [as handle_request] (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/layer.js:82:5)
    at /home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/index.js:267:22
    at Function.proto.process_params (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/index.js:321:12)
    at next (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/index.js:261:10)
    at Function.proto.handle (/home/ogajduse/Documents/repos/dosgen/dosgen-web/node_modules/express/lib/router/index.js:166:3)

dosgen-web/routes/dosgen.js

@@ -62,7 +62,7 @@ function parseAttacksArguments(arguments) {
     var attacksSettings = {};
 
     for (var attackFullName in arguments) {
-        if (arguments.hasOwnProperty(attackFullName)) {
+        if (Object.prototype.hasOwnProperty.call(arguments, attackFullName)) {
             var attackValue = arguments[attackFullName];
             var attackTypeAndArg = attackFullName.split(":");
             if (attackTypeAndArg.length != 2)