Use SIGQUIT instead of SIGINT

refs: #3870

Change-Id: I915d9422d56a441b351bb9ab38a0c8377e1da34f
diff --git a/ndn/nfd.py b/ndn/nfd.py
index b643e76..3e3e9da 100644
--- a/ndn/nfd.py
+++ b/ndn/nfd.py
@@ -59,7 +59,7 @@
         node.cmd("export HOME=%s" % node.homeFolder)
 
     def start(self):
-        NdnApplication.start(self, "nfd --config %s >> %s 2>&1 &" % (self.confFile, self.logFile))
+        NdnApplication.start(self, "setsid nfd --config %s >> %s 2>&1 &" % (self.confFile, self.logFile))
         time.sleep(2)
 
     def setStrategy(self, name, strategy):