Remove deprecated ThreadGroup and SecurityManager calls

apps/jrobin/java/src/org/rrd4j/core/RrdSyncThreadPool.java

@@ -137,8 +137,7 @@ public class RrdSyncThreadPool
         final String poolName;
 
         DaemonThreadFactory(String poolName) {
-            SecurityManager s = System.getSecurityManager();
-            group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
+            group = Thread.currentThread().getThreadGroup();
             this.poolName = poolName;
         }
 

apps/routerconsole/java/src/edu/internet2/ndt/Tcpbw100.java

@@ -4560,13 +4560,7 @@ public class Tcpbw100 extends JApplet implements ActionListener {
 			}
 			
 			if ( done == 0 ){
-				_log.warn("TG destroy");
-				try{
-					thread_group.destroy();
-					break;
-				}catch( Throwable e ){
-					_log.debug("TG", e);
-				}
+				break;
 			}
 			
 			try{
@@ -4594,8 +4588,6 @@ public class Tcpbw100 extends JApplet implements ActionListener {
 				}
 			};
 		
-		_thread_group.setDaemon( true );
-		
 		Thread t = 
 			new I2PAppThread( 
 				_thread_group,

apps/sam/java/src/net/i2p/sam/SAMv3Handler.java

@@ -390,7 +390,6 @@ class SAMv3Handler extends SAMv1Handler
 				try {
 					Thread.sleep(1000);
 				} catch ( InterruptedException e) {}
-			rec.getThreadGroup().destroy();
 			sSessionsHash.del(session.getNick());
 		}
 	}