Update Vagrantfile to eliminate double ssh ports

Vagrant shares port 2222 with our custom port, even though we do not tell it to.
Adding the ```id: ssh``` resolves that.
Goes from this:
```
==> local: Forwarding ports...
    local: 22 => 2238 (adapter 1)
    local: 22 => 2222 (adapter 1)
```
to this:
```
==> local: Forwarding ports...
    local: 22 => 2238 (adapter 1)
```