Wipe everything and (re)load middleware from policies
(policies.js config is already loaded at this point)

@api private
function(cb) {
            // Load policy modules
            sails.log.verbose('Loading policy modules from app...');
            sails.modules.loadPolicies(function modulesLoaded (err, modules) {
                if (err) return cb(err);
                _.extend(this.middleware, modules);
                //console.log('sails.middleware.policies', sails.middleware.policies);
                return cb();
            }.bind(this));
        }