i2ptunnel: Add hooks to get the session from the contoller

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnel.java

@@ -354,8 +354,9 @@ public class I2PTunnel extends EventDispatcherImpl implements Logging {
 
     /**
      *  @return A copy, unmodifiable, non-null
+     *  @since public since 0.9.53 for advanced plugin usage, was package private
      */
-    List<I2PSession> getSessions() { 
+    public List<I2PSession> getSessions() {
         if (_sessions.isEmpty())
             return Collections.emptyList();
         return new ArrayList<I2PSession>(_sessions); 

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/TunnelController.java

@@ -234,6 +234,15 @@ public class TunnelController implements Logging {
         _state = keyOK && getStartOnLoad() ? TunnelState.START_ON_LOAD : TunnelState.STOPPED;
     }
 
+    /**
+     *  The I2PTunnel
+     *
+     *  @since 0.9.53 for advanced plugin usage
+     */
+    public I2PTunnel getTunnel() {
+        return _tunnel;
+    }
+
     /**
      * @return success
      */