Refactor HAminorityRestart

- Split into two tests, one that kills ONOS and one that stops the
  service
- Check ONOS between brining some ONOS nodes down and up
- Set "gossip" time to be a function of # of nodes

Change-Id: I389164c8225b2e496db433552a7ba5a5a3e5c2bb
diff --git a/TestON/tests/HAsingleInstanceRestart/HAsingleInstanceRestart.params b/TestON/tests/HAsingleInstanceRestart/HAsingleInstanceRestart.params
index 3e31402..990bef4 100644
--- a/TestON/tests/HAsingleInstanceRestart/HAsingleInstanceRestart.params
+++ b/TestON/tests/HAsingleInstanceRestart/HAsingleInstanceRestart.params
@@ -60,6 +60,7 @@
     <timers>
         <LinkDiscovery>12</LinkDiscovery>
         <SwitchDiscovery>12</SwitchDiscovery>
+        <gossip>5</gossip>
     </timers>
     <kill>
         <switch> s5 </switch>