Admin: Add order creator tests
Admin: Add order creator tests

* Test that product orderability is checked while generating OrderSource
* Test for product line taxes
* Test person and company contacts and addresses

Refs SHOOP-1919 / SHOOP-1799

shawnadelic/shuup,akx/shoop,taedori81/shoop,shoopio/shoop,hrayr-artunyan/shuup,hrayr-artunyan/shuup,suutari/shoop,hrayr-artunyan/shuup,jorge-marques/shoop,jorge-marques/shoop,taedori81/shoop,suutari/shoop,suutari-ai/shoop,shawnadelic/shuup,suutari-ai/shoop,jorge-marques/shoop,akx/shoop,suutari/shoop,suutari-ai/shoop,shawnadelic/shuup,taedori81/shoop,akx/shoop,shoopio/shoop,shoopio/shoop