add has_systemd support for ubuntu 16.04

Author: mindriot88

manifests/server.pp

@@ -209,6 +209,10 @@
       $service_file = "/etc/systemd/system/redis-server_${redis_name}.service"
       if versioncmp($::operatingsystemmajrelease, '14.04') > 0 { $has_systemd = true }
     }
+    'Ubuntu': {
+      $service_file = "/etc/systemd/system/redis-server_${redis_name}.service"
+      if versioncmp($::operatingsystemmajrelease, '16.04') > 0 { $has_systemd = true }
+    }
     default:  {
       $service_file = "/etc/init.d/redis-server_${redis_name}"
       $has_systemd = false