Fix the command for ipv6 ping

Corret the typo in the forming the ipv6 ping command.
Replace the 'ping' with 'ping6'.

Change-Id: I371c794ccadde0221d01935f232c77b5f14c6dd5
Signed-off-by: Subhash Kumar Singh <subhash_singh@criterionnetworks.com>
diff --git a/TestON/drivers/common/cli/emulator/mininetclidriver.py b/TestON/drivers/common/cli/emulator/mininetclidriver.py
index 07acc01..b1c55de 100644
--- a/TestON/drivers/common/cli/emulator/mininetclidriver.py
+++ b/TestON/drivers/common/cli/emulator/mininetclidriver.py
@@ -578,7 +578,7 @@
         args = utilities.parse_args( [ "SRC", "TARGET", 'WAIT' ], **pingParams )
         wait = args['WAIT']
         wait = int( wait if wait else 1 )
-        command = args[ "SRC" ] + " ping " + \
+        command = args[ "SRC" ] + " ping6 " + \
             args[ "TARGET" ] + " -c 1 -i 1 -W " + str( wait ) + " "
         try:
             main.log.info( "Sending: " + command )