Update group_test unit tests
Update group_test unit tests

This is to bring tests up to date with the following changes:

3bd0f77cba8c319d66018208c839d1c47c57504b
- removed create_user_request

addf958ec4c87f8b248891f7a101e1831eb64454
- removed create_group_request
- removed join_group_request
- removed leave_group_request

Also api.group.leave_group for an owner now raises and InternalException
rather than a WebException

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