ndn_application: init processId and fix nfd not being killed

Change-Id: I3ec5d79f903130d0ce42fd1c2a18bd73065757e7
refs: #3671
diff --git a/ndn/nfd.py b/ndn/nfd.py
index 45f873a..17c7b4a 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, "sudo nfd --config %s 2>> %s &" % (self.confFile, self.logFile))
+        NdnApplication.start(self, "nfd --config %s 2>> %s &" % (self.confFile, self.logFile))
         time.sleep(2)
 
     def setStrategy(self, name, strategy):