Robot test case for cluster controller restart tests.
Also increase polling retries for the lldp flows during onos boot.

Change-Id: Icf16f935addc394f43dd8fe2b223543ca3043e80
diff --git a/src/test/robot/cluster.robot b/src/test/robot/cluster.robot
index bc7cffb..fe1d2fd 100644
--- a/src/test/robot/cluster.robot
+++ b/src/test/robot/cluster.robot
@@ -6,6 +6,7 @@
 
 *** Variables ***
 ${NODES}          3
+${EXTRA_OPTS}     -v
 
 *** Test Cases ***
 Verify Onos DHCP Server Functionality