Kill dhclient and dhcpd during test cleanup

Change-Id: I97624f7b13ab15bf8682e875868b1e52fb7f3f55
diff --git a/TestON/bin/cleanup.sh b/TestON/bin/cleanup.sh
index 153bb26..ec67ea6 100755
--- a/TestON/bin/cleanup.sh
+++ b/TestON/bin/cleanup.sh
@@ -33,6 +33,8 @@
 sudo pkill bgpd
 sudo pkill zebra
 sudo pkill vrrpd
+sudo pkill dhclient
+sudo pkill dhcpd
 sudo kill -9 `ps -ef | grep "bird" | grep -v grep | awk '{print $2}'`