Update Test Errorlog use cases testing logic

Existing test assumes that clearing the logs works, creates one
and index 0 of the list is the one created for the test.

The new changes address the following:
  - Clear eventlog should not be 'the' factor to fail the test
    because event can be created and still validated
  - Clear eventlog failure would reported by new test case
  - bustcl returns event out as in format 'q event_number'
    example  'q 154'. Test will fails
     1. If this event number generated is not listed
     2. If there is an error during command execution

Resolves openbmc/openbmc-test-automation#146

Change-Id: I4ea87c04bd35279727d6966f8372cdcc4e8a9fd6
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
1 file changed