ansible/ansible-modules-core — pull request #548 by mavit (2014-12-21 20:08:41+00:00)
Title: Fix appending to a user's group on Solaris

Without this change, you get:

AttributeError: 'set' object has no attribute 'extend'

Tested on a Solaris 11.2 client with the included Python 2.6.8.