Due to inspec deprecation warnings

[alexpop]

The audit cookbook shows these DEPRECATION warnings during run:

       [2017-05-18T15:10:46+00:00] INFO: Running tests from: [{:name=>"cis-docker-benchmark", :url=>"https://github.com/dev-sec/cis-docker-benchmark/archive/1.3.0.tar.gz"}]
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
       [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709

[chris-rock]

Thank you @alexpop