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. 
Thinking about this some more, perhaps there's a resource we could use here? Just because the user exists doesn't necessarily mean that it has all the parameters set that were defined in the command.