Setting up repo for master Juno Branch

* Update metadata version
* Adding Gemfile.lock to .gitignore
* Removing Strainer file
* Updating Gems
  * chef (11.12.0)
  * chefspec (4.0.0)
  * rspec (3.0.0)

Change-Id: I15718d45fb2feb5f42f0e71fa201992df5508aee
Partial-Bug: 1349865