Added test cases to add user with same name and null password
Added test cases to add user with same name and null password

Change-Id: Iee7d5f6a206b7af5e8488a6873fb9fd90193cdbb
Signed-off-by: Rahul Maheshwari <a806e6fd77e56dd64ff6084a06bbf3a5a70392ef@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation