Introduce getChannel() by peerId

ethereumj-core/src/main/java/org/ethereum/net/server/ChannelManager.java

@@ -47,6 +47,23 @@ public class ChannelManager {
     public void init() {
         scheduleChannelCollector();
     }
+    
+    
+    public Channel getChannel(String peerId){
+        
+        for (Channel channel : channels){
+
+
+            String tablePeerId = channel.getP2pHandler().getHandshakeHelloMessage().getPeerId();
+            if (tablePeerId != null &&
+                peerId.equals(tablePeerId)){
+                
+                return channel;
+            }
+        }
+        
+        return null;
+    }
 
     public void recvTransaction() {
         // ???