Added test to change root user password
Added test to change root user password

Change-Id: I560284f99c0bc0afa33c5db3ce3fbf75be90c4b4
Signed-off-by: Rahul Maheshwari <a806e6fd77e56dd64ff6084a06bbf3a5a70392ef@in.ibm.com>

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