Remove check for enterprise plugin

The enterprise plugin is long, long gone and would unlikely to be compatible with any modern (or even most old and ancient) version of Openfire.

This comit removes the explicit check for its existence.

Author: guusdk

src/java/org/jivesoftware/openfire/plugin/MonitoringPlugin.java

@@ -17,7 +17,6 @@
 package org.jivesoftware.openfire.plugin;
 
 import java.io.File;
-import java.io.FileFilter;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -173,13 +172,6 @@ public void initializePlugin(PluginManager manager, File pluginDirectory) {
         xep0313Support2 = new Xep0313Support2(XMPPServer.getInstance());
         xep0313Support2.start();
 
-        // Check if we Enterprise is installed and stop loading this plugin if found
-        if (manager.getPluginByName("enterprise").isPresent()) {
-            // Do not load this plugin since Enterprise is still installed
-            System.out.println("Enterprise plugin found. Stopping Monitoring Plugin");
-            throw new IllegalStateException("This plugin cannot run next to the Enterprise plugin");
-        }
-
         // Make sure that the monitoring folder exists under the home directory
         final Path monitoringFolder = JiveGlobals.getHomePath().resolve(MonitoringConstants.NAME);
         if (!Files.exists(monitoringFolder))