Improve host discovery (IPv6) and link events verification methods in CHO test

- Add a less stressful ping method to replace IPv6 pingall when
  discovering hosts
- Add retries when verifying link down/up events
- Fix some typos

Change-Id: I25f974b9b7c490282b4a822e5fddc7e167bb75a0
diff --git a/TestON/tests/CHOtest/CHOtest.params b/TestON/tests/CHOtest/CHOtest.params
index 1d15bf3..2062a4a 100644
--- a/TestON/tests/CHOtest/CHOtest.params
+++ b/TestON/tests/CHOtest/CHOtest.params
@@ -1,5 +1,5 @@
 <PARAMS>
-    # 1,20,3,[40,5,140,60,160,70,170,80,180,10,5,90,190,71,171,81,181,10,5]*50,21,3,[41,5,141,61,161,72,172,82,182,10,5,91,191,73,173,83,183,10,5]*50,22,3,[42,5,142,62,162,74,174,84,184,10,5,92,192,75,175,85,185,10,5]*50
+    # 1,20,3,47,147,[5,60,160,70,170,80,180,10,5,90,190,71,171,81,181,10]*20,200,21,3,48,148,[5,61,161,72,172,82,182,10,5,91,191,73,173,83,183,10]*20,200,22,3,49,149,[5,62,162,74,174,84,184,10,5,92,192,75,175,85,185,10]*20
     # 1. Starts ONOS cluster with 5 nodes
     # 20. Starts Att Topology
     # 21. Starts Chordal Topology
@@ -18,7 +18,7 @@
     # 19X. IPv6 ping across Point,Multi-single,Single-Multi Intents
 
 <testcases>
-1,20,3,[48,5,60,70,80,10,5,90,71,81,10,5]*10,200,21,3,[47,5,61,72,82,10,5,91,73,83,10,5]*10,200,22,3,[42,5,62,74,84,10,5,92,75,85,10,5]*10
+1,20,3,47,147,[5,60,160,70,170,80,180,10,5,90,190,71,171,81,181,10]*10,200,21,3,48,148,[5,61,161,72,172,82,182,10,5,91,191,73,173,83,183,10]*10,200,22,3,49,149,[5,62,162,74,174,84,184,10,5,92,192,75,175,85,185,10]*10
 </testcases>
 
     <GIT>
@@ -36,7 +36,7 @@
         <topo>topoAttIpv6.py</topo>
         <numSwitches>25</numSwitches>
         <numHosts>25</numHosts>
-        <numLinks>114</numLinks>
+        <numLinks>112</numLinks>
         <numPaths>1</numPaths>
     </TOPO1>
 
@@ -90,10 +90,10 @@
         <LinkDiscovery>15</LinkDiscovery>
         <SwitchDiscovery>10</SwitchDiscovery>
         <IntentPurgeDelay>15</IntentPurgeDelay>
-        <CheckIntentDelay>8</CheckIntentDelay>
+        <CheckIntentDelay>15</CheckIntentDelay>
         <topoCheckDelay>15</topoCheckDelay>
         <pingSleep>3</pingSleep>
-        <pingTimeout>1200</pingTimeout>
+        <pingTimeout>300</pingTimeout>
         <remHostDelay>5</remHostDelay>
         <remDevDelay>10</remDevDelay>
     </timers>
@@ -102,6 +102,7 @@
         <pauseTest>off</pauseTest>
         <email>off</email>
         <intentChecks>8</intentChecks>
+        <linkChecks>3</linkChecks>
         <topoChecks>3</topoChecks>
         <numPings>5</numPings>
     </TEST>