Add support for parallels & virtuozzo linux

[jaxxstorm]

Both parallels and virtuozzo linux are redhat derivatives and their suite of operating systems (virtuozzo linux, parallels cloud server etc) aren't detected correctly at the moment. Adding their OS to the REDHAT_FAMILY constant seems to get that fixed up

Before:

inspec shell -c 'os.params'
{:name=>"virtuozzo", :family=>"virtuozzo", :release=>"7.0.0", :arch=>"x86_64"}

inspec exec test.rb

Target:  local://


  Port 22
     ↺  The `port` resource is not supported on your OS yet.

Test Summary: 0 successful, 0 failures, 1 skipped

After:

inspec shell -c 'os.params'
{:name=>"virtuozzo", :family=>"redhat", :release=>"7.0.0", :arch=>"x86_64"}

Target:  local://


  Port 22
     ✔  should be listening

Test Summary: 1 successful, 0 failures, 0 skipped

[chris-rock]

Thank you for adding this @jaxxstorm