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

[Alexander Belchenko]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

bb:approve
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFG3nxDzYr338mxwCURAvJXAJ9hAAqV5khg4J/G0ItIE88ME4Z+ZgCdGSua
iuZWZ7r6dcpRJRzStO9yl+M=
=PDkD
-----END PGP SIGNATURE-----