Modified every IPv4 pingall case to execute multiple times

Change-Id: I2bd96cb89c22cc65d79f3c9e83c283d06ee60722
diff --git a/TestON/tests/CHOtest/CHOtest.params b/TestON/tests/CHOtest/CHOtest.params
index 590b37f..5f8c205 100644
--- a/TestON/tests/CHOtest/CHOtest.params
+++ b/TestON/tests/CHOtest/CHOtest.params
@@ -91,6 +91,7 @@
         <SwitchDiscovery>10</SwitchDiscovery>
         <IntentPurgeDelay>15</IntentPurgeDelay>
         <CheckIntentDelay>8</CheckIntentDelay>
+        <pingSleep>3</pingSleep>
     </timers>
 
     <TEST>