missing os.sched* functionality
Created originally on Bitbucket by mattip
Apparently CPython added an interface to the os scheduler in python 3.3, we lack support for it in posix. Tests in
lib-python/3/test/test_posix.py are silently skipped, even on linux where it should exist.
This turns out is used in CI testing to determine how many cpus can be used.
Since this means someone is trying to get PyPy into their test matrix, we should try to encourage them.