Merge pull request #113 from rndmh3ro/priv_sep_1804

Add separate PrivilegeSeparation check for Ubuntu 1804

Author: artem-sidorenko

libraries/ssh_crypto.rb

@@ -198,6 +198,11 @@ def valid_privseparation
       when /7\./
         ps = ps59
       end
+    when 'ubuntu'
+      case inspec.os[:release]
+      when /18\./
+        ps = ps75
+      end
     when 'alpine'
       ps = ps75
     end