tests: Update for _io/_collections module having been renamed.

tests/basics/class_store_class.py

tests/basics/namedtuple1.py

tests/basics/ordereddict1.py

tests/bench/var-8-namedtuple-1st.py

tests/bench/var-8.1-namedtuple-5th.py

tests/io/buffered_writer.py

tests/io/stringio1.py

tests/io/stringio_with.py

tests/misc/print_exception.py

tests/misc/recursive_data.py