modify the version for testnet.

Author: zhaohong

src/main/resources/config.conf

@@ -47,7 +47,7 @@ node {
   maxActiveNodes = 30
 
   p2p {
-    version = 50 # 50: testnet; 101: debug
+    version = 51 # 51: testnet; 101: debug
   }
 
 }