Fixing up repo for stable/icehouse branch

* Adding defaultbranch to .gitreview
* Removing Berksfile.lock from .gitignore
* Adding updated Berksfile.lock file
* Updating Gems
  * chef (11.12.0)
  * chefspec (4.0.0)
  * rspec (3.0.0)
* Cleanup specs for 4.x

Change-Id: I4c2d4ee293c2430609c4fdcf6dc374992c27cb95
Partial-Bug: 1349154