Support webpack'ing hawk

[djmitche]

Currently, if the most recent version is used in a webpack'd context, it fails because dns and dgram are not available in a web context. Those are requirements of @hapi/sntp, which is an (optional) requirement of hawk on Node, but not something that a browser can use.

Probably the easiest option here is to remove the sntp dependency, replacing it with a few steps to enable it. Maybe

const Sntp = reqiure('@hapi/sntp');
const Hawk = require('hawk');

Sntp.start();
Hawk.setTimeFunction(Sntp.now)

[djmitche]

It still depends on Buffer, url, stream, and crypto :(