Same domain for multiple apps?

## Prerequisites

* [x] I am running the latest version. (`up upgrade`)
* [x] I searched to see if the issue already exists.
* [x] I inspected the verbose debug output with the `-v, --verbose` flag.
* [ ] Are you an Up Pro subscriber?

## Description

I'd like to use the same domain for multiple apps, just different paths. Hope this is possible :+1:

I'm getting this error,

```
ApiDomainProduction: beta.example.co already exists in stack arn:aws:cloudformation:eu-north-1:-1:stack/dashboard/398f7f00-fed7-11e9-68b8-06cb12623298
```

## Steps to Reproduce

Have at least two apps like

```
{
"name": "app",
"stages": {
"beta": {
"domain": "beta.example.co",
"zone": "beta.example.co",
"path": "/app"
}
}
}
```

and

```
{
"name": "api",
"stages": {
"beta": {
"domain": "beta.example.co",
"zone": "beta.example.co",
"path": "/api"
}
}
}
```

And so forth. Then run `up stack plan -v` & `up stack apply -v` - even thought the `verbose`-flag doesn't work for `apply` :thinking:

## Love Up?

Yes! Definitely, it's super awesome. Just need to know how to do this, and then I'll - hopefully - be able to purchase pro :cupid: