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````
Yes. You want make sure there are no regressions when default_orgname is enabled.