bzrlib.tests.test_transport_implementations use load_tests.
* bzrlib/tests/test_transport_implementations.py:
(load_tests): Defined to avoid special case in
bzrlib.tests.test_suite().
* bzrlib/tests/__init__.py:
(test_suite): bzrlib.tests.test_transport_implementations moved from
test_transport_implementations to testmod_names.