Make interreop parametrized tests IDs unique.
* bzrlib/tests/test_selftest.py:
(TestInterRepositoryProviderAdapter.test_adapted_tests): Update
with the new IDs.
* bzrlib/tests/interrepository_implementations/__init__.py:
(InterRepositoryTestProviderAdapter.formats_to_scenarios):
Provides unique ids for tests to help defect localization.