Include the Chef-cli as gem with the test-kitchen hab package

[ashiqueps]

Description

The Chef-cli executable is needed for the test-kitchen to work correctly when the cookbook uses the policyfiles for dependency management. This PR adds the chef-cli as a gem to the test-kitchen hab package for the RC1 release.

Later, this will be reverted since the workstation hab package will have the chef-cli as a separate hab package.

Related Issue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• I have read the CONTRIBUTING document.
• I have run the pre-merge tests locally and they pass.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• If Gemfile.lock has changed, I have used --conservative to do it and included the full output in the Description above.
• All new and existing tests passed.
• All commits have been signed-off for the Developer Certificate of Origin.