Make doc.load use kwargs instead of ordered args
Make doc.load use kwargs instead of ordered args

This is because in the python codegen change we modified the order of
the params to allow the optional to be (=None) and only optionally
specified. With this change, the cwl-util tests pass

common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad