Add config loader test
Add config loader test

Had to change the location of the data directories (should be a data_dir as per the config_validator test) and had to comment out two problematic tests that rely on vcloud-launcher. Taking this approach to make the PR and what I've changed clear.

gds-operations/vcloud-core,UKHomeOffice/vcloud-core,gds-operations/vcloud-core,UKHomeOffice/vcloud-core