Fix invalid boot policy test case

The changes includes:
    - Removing known_issue tag as we are no longer using this tag
    - Ignoring "Set Boot Policy" failure. In this case, "Set Boot
      Policy" failure is expected behavior and constitutes a successful
      test
    - Add keyword name tag as per openbmc/openbmc-test-automation#126
    - Update test documentation

Change-Id: Idce9a5ffb76fbc3920b5dc2619d4c0a5d8b4bb76
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
1 file changed