Add admin and orgs

Add recipes for creating admin users and creating organizations.

Borrowed functionality from @misheska at https://github.com/misheska-cookbooks/chef-server12

Would like to combine the functionality provided by these two cookbooks into one chef-server cookbook to rule them all. 
let's make these:

```yaml
admin:
  username: flock
  firstname: Florian
  lastname: Lock
  email: ops@example.com
  password: DontUseThis4Real
```

So they don't look like something that resembles a "real" user for testing purposes.

</bikeshed>