Add testnet genesis tx as output by CN reference

src/cryptonote_config.h

@@ -134,7 +134,7 @@ namespace config
     boost::uuids::uuid const NETWORK_ID = { {
         0x12 ,0x30, 0xF1, 0x71 , 0x61, 0x04 , 0x41, 0x61, 0x17, 0x31, 0x00, 0x82, 0x16, 0xA1, 0xA1, 0x11
       } }; // Bender's daydream
-    std::string const GENESIS_TX = "CHANGEME";
+    std::string const GENESIS_TX = "013c01ff0001ffffffffffff0f029b2e4c0281c0b02e7c53291a94d1d0cbff8883f8024f5142ee494ffbbd0880712101168d0c4ca86fb55a4cf6a36d31431be1c53a3bd7411bb24e8832410289fa6f3b";
     uint32_t const GENESIS_NONCE = 10001;
   }
 }