Remove custom before handler in favour of ootb lifecycle hooks on routes

[kristofsajdak]

As of hapi 10.40 hapi supports adding lifecycle extensions at the route level in the route config: hapijs/hapi#2566

We can now do the following

config: {
            ext: {
                onPreHandler: {
                    method: function (req, reply) {
                        var data = req.payload.data
                        data.timeOfReception = new Date()
                        reply.continue()
                    }
                }
            }
        }

Proposing we remove the specific before handler code in hapi-harvester : https://github.com/agco/hapi-harvester/blob/develop/lib/plugin.js#L157

and leverage the standard lifecycle route handlers instead