Add IPMI_USERNAME default user name

Change-Id: Icc1495ac4b8b2ccd872c5317eef0dd9d466eb3ec
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/resource.robot b/lib/resource.robot
index e8b5ccf..26f776a 100755
--- a/lib/resource.robot
+++ b/lib/resource.robot
@@ -46,6 +46,7 @@
 # Path of mTLS certificates directory.
 ${CERT_DIR_PATH}       ${EMPTY}
 
+${IPMI_USERNAME}       root
 ${IPMI_PASSWORD}       0penBmc
 ${MACHINE_TYPE}    palmetto
 ${DBUS_POLL_INTERVAL}      15s