Update unit tests configuration

[legal90]

Currently we have unit tests failed because of a cheffish gem conflict (is required by chef-dk gem). This PR removes some unnecessary gem dependencies and introduces Chef Delivery CLI for running tests, like Chef Software does that for their cookbooks.

• Use Berkshelf for dep resolving in ChefSpec. Policyfile resolver for ChefSpec requires "chef-dk" gem, which has pretty big dependency tree. So, for unit tests it's better just to use Berkshelf.
• Disable CodeClimate reporter
• Gemfile: Remove unnecessary gems
• Use Chef Delivery CLI to run spec and style checks
• Add "chef_version" to metadata

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@da7f406). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #426   +/-   ##
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  Coverage          ?   69.46%           
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  Files             ?        7           
  Lines             ?      357           
  Branches          ?        0           
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  Hits              ?      248           
  Misses            ?      109           
  Partials          ?        0

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[legal90]

@johnbellone Do we really need this codecov integration in CI? It doesn't look helpful at the moment, IMO.

[johnbellone]

@legal90 It should be disabled as of right now.

[lock[bot]]

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