[4.6] parametrized: ids: support generator/iterator #128
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Fixes pytest-dev#759
Adjust test_parametrized_ids_invalid_type, create list to convert tuples
Ref: Parameterized ids can't be integers (was allowed in 2.9.2) pytest-dev/pytest#1857 (comment)
Changelog for int to str conversion
Ref: Parameterized ids can't be integers (was allowed in 2.9.2) pytest-dev/pytest#1857 (comment)
(cherry picked from commit 2c941b5)
Conflicts:
src/_pytest/mark/structures.py
src/_pytest/python.py
testing/python/metafunc.py