Disable MTU ping test check in system cleanup robot code

Due to different systems config out there, commenting out to
avoid failure during system clean up from robot code.

Change-Id: I850a63c4736ede9f2dd45502f5def1cc8bc9f5ca
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/extended/standby_bmc.robot b/extended/standby_bmc.robot
index 34162c9..f86e2c1 100644
--- a/extended/standby_bmc.robot
+++ b/extended/standby_bmc.robot
@@ -47,7 +47,7 @@
     ...  Wait For Host To Ping  ${OPENBMC_HOST}  2 mins
 
     # Check if the ping works using 1400 MTU.
-    Run Keyword if  ${ping_status} == ${True}  MTU Ping Test
+    #Run Keyword if  ${ping_status} == ${True}  MTU Ping Test
 
     Run Keyword if  ${ping_status} == ${False}
     ...  Fail  ${OPENBMC_HOST} ping test failed.