Add default_orgname tests


 -- Added "default_orgname" support

In "layouts" key, add

````"default_orgname": "deforg"````

Pedant tests are modified to run both pedant in normal mode, and if ````default_orgname```` is set, to run pedant with ````--use-default-org````
Should pedant without options still run if node['private-chef']['default_orgname'] is not set?  Wondering if should be one or the other, or both pedant commands should run in the case default_orgname is configured.