ping: don't setNonce

refs #2826

Change-Id: Ia4b7812383433550f933283ca6384873c5451057
diff --git a/tools/ping/client/ping.cpp b/tools/ping/client/ping.cpp
index 74cbcac..dbc2d45 100644
--- a/tools/ping/client/ping.cpp
+++ b/tools/ping/client/ping.cpp
@@ -57,7 +57,6 @@
   Interest interest(pingPacketName);
   interest.setMustBeFresh(!m_options.shouldAllowStaleData);
   interest.setInterestLifetime(m_options.timeout);
-  interest.setNonce(m_nextSeq);
 
   m_face.expressInterest(interest,
                          bind(&Ping::onData, this, _1, _2, m_nextSeq, time::steady_clock::now()),