[MERGE] Convert tests.blackbox.test_i* to use bzr internals and add tests.blackbox.test_unknowns

[Aaron Bentley]

Aaron Bentley has voted approve.
Status is now: Approved


For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C1188957765.6242.28.camel%40lapbert%3E