[chef] Chef Sugar v2.1.0

[Seth Vargo < >]

Ohai Chefs!

I just released Chef Sugar v2.1.0

### Improvements
- Add `solaris2?` matcher
- Add `aix?` matcher
- Add 'lxc?' matcher

### Bug Fixes
- Fix a bug in namespace memoization during attribute initialization

This release is fully backwards-compatible.

Keep makin' it sweet!
Seth
@sethvargo

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