[Checkins] [zopefoundation/RestrictedPython] 32b867: Allow `sets` again.

[GitHub]

  Branch: refs/heads/re-add-sets
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: 32b867b264766b5e7376abe12a44f69fd44424af
      https://github.com/zopefoundation/RestrictedPython/commit/32b867b264766b5e7376abe12a44f69fd44424af
  Author: Michael Howitz <mh at gocept.com>
  Date:   2017-03-14 (Tue, 14 Mar 2017)

  Changed paths:
    M src/RestrictedPython/Utilities.py
    M tests/builtins/test_utilities.py

  Log Message:
  -----------
  Allow `sets` again.

This is for backwards compatibility with existing code which might use sets.