curved braces necessary for not_if

without curved braces the function does not run in Chef 11.6(cherry picked from commit 302f258e93c58d70f5568f9a752efcbef1347d60)
Add filesystem freeze/unfreeze actions.
Avoid warning about already initialized constant.
Add ChefSpec matchers for filesystem resource.
Use use_inline_resources so it can be notified.
Merge pull request #6 from douglaswth-cookbooks/fsfreeze

Add filesystem freeze/unfreeze actions.