[WIP] Improvements to unit tests. (#3574)

* Improvemenets to unit tests.

* Break up modelfactory into multiple files, populate many states.
* Begin testing validation at the unit test level, test relationships.
* Add tests for Asset::availableForCheckout.
* Model factories now generate all needed relationships on demand,
  which allows us to unit test with a empty database.
* To faciliate the empty database, we move to using sqlite in memory as
  the unit testing database.

* Fix bug with logs of checkouts to non users.

* Fix location finding for assets.  Also Fix location show page to show users associated with location.  Still need some work to show assets.

* More test and generator improvements

* More unit test fixes. PermissionsTest is borked still.

* More Updates

* Rewrite permissionstest.  Check that we have access on the model level rather than via web requests.  Also test delete permissions.

* Fix seeders.

* Make the default asset model factory generate assets that are rtd for testing.

* Save progress.

* Rebase tests, fix department unit test, update database for functional tests.

* Update functional and api tests to use new modelfactory signatures.

phpunit.xml

@@ -23,5 +23,7 @@
         <env name="CACHE_DRIVER" value="array"/>
         <env name="SESSION_DRIVER" value="array"/>
         <env name="QUEUE_DRIVER" value="sync"/>
+
+        <env name="DB_CONNECTION" value="sqlite_testing" />
     </php>
 </phpunit>