These tests were failing:

    1) NetexImport POST netex_imports with correct credentials and incorrect request behaves like illegal attributes missing file does not succeed
       Failure/Error: expect( json_response_body['errors'][bad_attribute.to_s] ).not_to be_empty

       TypeError:
         no implicit conversion of String into Integer
       Shared Example Group: "illegal attributes" called from ./spec/requests/api/v1/netex_import_spec.rb:90
       # ./spec/requests/api/v1/netex_import_spec.rb:77:in `[]'
       # ./spec/requests/api/v1/netex_import_spec.rb:77:in `block (6 levels) in <top (required)>'
       # -e:1:in `<main>'

    2) NetexImport POST netex_imports with correct credentials and incorrect request name already taken behaves like illegal attributes missing name does not succeed
       Failure/Error: expect( json_response_body['errors'][bad_attribute.to_s] ).not_to be_empty

       TypeError:
         no implicit conversion of String into Integer
       Shared Example Group: "illegal attributes" called from ./spec/requests/api/v1/netex_import_spec.rb:96
       # ./spec/requests/api/v1/netex_import_spec.rb:77:in `[]'
       # ./spec/requests/api/v1/netex_import_spec.rb:77:in `block (6 levels) in <top (required)>'
       # -e:1:in `<main>'

The problem was caused by the fact that the error messages come back
from `ErrorFormat` as an array of hashes, which contain a single key
corresponding to the invalid field.

Instead, the error messages should be returned as a single hash with a
bunch of keys corresponding to the invalid fields.

This change gets the above tests to pass.

Speed up these tests by using `build_stubbed` for factories where
possible.

Debugging Java Integration (ZipService -> HTTPService -> Object Creation)

   - Created an ErrorFormat concern to see what went wrong in the HTTP call
     as so many things can go wrong due to:

      * Timeout Issues
      * Illegal database setup or cleaning before tests