Add support for parallels & virtuozzo linux

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
contstant seems to get that fixed up

lib/train/extras/os_detect_linux.rb

@@ -14,7 +14,7 @@
 module Train::Extras
   module DetectLinux # rubocop:disable Metrics/ModuleLength
     DEBIAN_FAMILY = %w{debian ubuntu linuxmint raspbian}.freeze
-    REDHAT_FAMILY = %w{centos redhat oracle scientific enterpriseenterprise xenserver cloudlinux ibm_powerkvm nexus_centos wrlinux}.freeze
+    REDHAT_FAMILY = %w{centos redhat oracle scientific enterpriseenterprise xenserver cloudlinux ibm_powerkvm nexus_centos wrlinux virtuozzo parallels}.freeze
     SUSE_FAMILY = %w{suse opensuse}.freeze
 
     include Train::Extras::LinuxLSB