Merge branch '6577-move-unmaintained-old-plugins-to-docs' into 'develop'

Resolve "Move unmaintained old plugins to docs"

Closes #6577

See merge request ispconfig/ispconfig3!1805

Author: Till Brehm

…lugins-available/bind_dlz_plugin.inc.php …d_server_plugins/bind_dlz_plugin.inc.phpserver/plugins-available/bind_dlz_plugin.inc.php renamed to docs/old_server_plugins/bind_dlz_plugin.inc.php server/plugins-available/bind_dlz_plugin.inc.php renamed to docs/old_server_plugins/bind_dlz_plugin.inc.php

@@ -0,0 +1,18 @@
+<?php
+
+if(!defined('INSTALLER_RUN')) die('Patch update file access violation.');
+
+class upd_0099 extends installer_patch_update {
+
+	public function onAfterSQL() {
+		global $inst;
+
+        // Remove old server plugins, unless they are currently enabled
+        if(!is_link('/usr/local/ispconfig/server/plugins-enabled/nginx_reverseproxy_plugin.inc.php'))
+            unlink('/usr/local/ispconfig/server/plugins-available/nginx_reverseproxy_plugin.inc.php');
+        if(!is_link('/usr/local/ispconfig/server/plugins-enabled/bind_dlz_plugin.inc.php'))
+            unlink('/usr/local/ispconfig/server/plugins-available/bind_dlz_plugin.inc.php');
+		
+	}
+
+}