Remove pre stop.

manifests/pre.pp

 class irc_bouncer::pre {
-  exec { 'stop znc':
-    command => '/bin/systemctl stop znc',
-  } -> Irc_bouncer::Module <| |>
+  # exec { 'stop znc':
+  #   command => '/bin/systemctl stop znc',
+  # } -> Irc_bouncer::Module <| |>
 }