This updates TestCase.create_local_site(),

TestCase.create_review_group(), and TestCase.create_repository() to

provide type hints and new arguments for setting membership lists.
create_local_site() accepts users and admins arguments for setting

the user and administrator lists.
create_review_group() accepts a users list for group membership.
create_repository() accepts review_groups and users ACL lists.

Unit tests pass.
Made use of these in some in-progress changes.