Refactor IntentRerouteLatency test
    - Refactor IntentRerouteLatency and IntentRerouteLatWithFOBJ test
    - Using driver function to handle ONOS
    - Improve algorithm, fix a calculation bug

Change-Id: I994295e0be361f99899c223cf90db70dd22cfb8c
diff --git a/TestON/drivers/common/cli/onosdriver.py b/TestON/drivers/common/cli/onosdriver.py
index 1abf258..7f59be8 100755
--- a/TestON/drivers/common/cli/onosdriver.py
+++ b/TestON/drivers/common/cli/onosdriver.py
@@ -1664,6 +1664,8 @@
                 "stop/waiting",
                 "Not Running ...",
                 pexpect.TIMEOUT ], timeout=120 )
+            self.handle.sendline( "" )
+            self.handle.expect( "\$" )
 
             if i == 0 or i == 1:
                 main.log.info( "ONOS is running" )