OF-1147: Refactoring of Plugin Management

- Plugin Monitor moved to different class
- Methods that operate on plugin.xml files moved to utilility class
  (and made to work even when plugin is not yet loaded)
- Plugin monitoring now loads plugins more efficiently by:
-- Observing parent/child hierarchy (allowing for one-shot load)
-- allowing for concurrent plugin loading
- Dev plugins are now processed as if they were ordinary plugins
- Plugin canoncical naming is now used throughout the code (fixes
  case sensitivity bug)

build/lib/dist/log4j.xml

@@ -79,6 +79,9 @@
 	<logger name="org.jivesoftware.openfire.container.PluginManager">
 		<appender-ref ref="console"/>
 	</logger>
+	<logger name="org.jivesoftware.openfire.container.PluginMonitor">
+		<appender-ref ref="console"/>
+	</logger>
 
 	<!-- OF-506: Jetty INFO messages are generally not useful. Ignore them by default. -->
 	<logger name="org.eclipse.jetty">

src/java/org/jivesoftware/openfire/container/License.java

+/*
+ * Copyright 2016 IgniteRealtime.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.openfire.container;
+
+/**
+ * An enumeration for license agreement types.
+ */
+public enum License
+{
+    /**
+     * Distributed using a commercial license.
+     */
+    commercial,
+
+    /**
+     * Distributed using the GNU Public License (GPL).
+     */
+    gpl,
+
+    /**
+     * Distributed using the Apache license.
+     */
+    apache,
+
+    /**
+     * For internal use at an organization only and is not re-distributed.
+     */
+    internal,
+
+    /**
+     * Distributed under another license agreement not covered by one of the other choices. The license agreement
+     * should be detailed in a Readme or License file that accompanies the code.
+     */
+    other
+}

src/web/plugin-admin.jsp

@@ -85,14 +85,7 @@
     }
 
     if (csrf_check && deletePlugin != null) {
-        File pluginDir = pluginManager.getPluginDirectory(pluginManager.getPlugin(deletePlugin));
-        File pluginJar = new File(pluginDir.getParent(), pluginDir.getName() + ".jar");
-        // Also try the .war extension.
-        if (!pluginJar.exists()) {
-            pluginJar = new File(pluginDir.getParent(), pluginDir.getName() + ".war");
-        }
-        pluginJar.delete();
-        pluginManager.unloadPlugin(pluginDir.getName());
+        pluginManager.deletePlugin( deletePlugin );
         // Log the event
         webManager.logEvent("deleted plugin "+deletePlugin, null);
         response.sendRedirect("plugin-admin.jsp?deletesuccess=true");