Bug 1362443 - Vagrant: Forward port 5000 for webpack-dev-server
Bug 1362443 - Vagrant: Forward port 5000 for webpack-dev-server

This allows running the dev server from within Vagrant, in case
people don't have a nodejs environment on the host.

After this lands users must run `vagrant reload --provision` to pick
up the changes to `Vagrantfile`.

edmorley/treeherder,KWierso/treeherder,tojon/treeherder,tojonmz/treeherder,edmorley/treeherder,tojonmz/treeherder,tojon/treeherder,tojonmz/treeherder,tojonmz/treeherder,tojonmz/treeherder,edmorley/treeherder,tojonmz/treeherder,KWierso/treeherder,tojon/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,tojon/treeherder