Fix for failing test case - Set valid system time.
Fix for failing test case - Set valid system time.

What is the fix:
    - Need to set time owner to HOST and time mode
      to MANUAL before setting time using IPMI.

Resolves openbmc/openbmc-test-automation#495

Change-Id: I019b88a2e7a31725d071975e064effe052169d85
Signed-off-by: Rahul Maheshwari <a806e6fd77e56dd64ff6084a06bbf3a5a70392ef@in.ibm.com>

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