Deprecation of contain_duplicates in inspec

[artem-sidorenko]

[DEPRECATION] `contain_duplicates` is deprecated and will be removed for InSpec 1.0. See https://github.com/chef/inspec/issues/738 for more details
[DEPRECATION] `contain_duplicates` is deprecated and will be removed for InSpec 1.0. See https://github.com/chef/inspec/issues/738 for more details

Related issue: inspec/inspec#738

The related code is in the os_spec.rb

[chris-rock]

+1 we should fix them