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: I7e1cb70619030ffbc9a99745ee56cc186835eb7e
Partial-Bug: 1349154