Fix association test cases

Fixes:
   - Add new keyword for getting error log URLs "Get Elog URL List"
   - Replace direct entry indexing to entry list indexing
   - Reduce Read Attribute call for "Verify Test Error Log And Callout"

Resolves openbmc/openbmc-test-automation#734

Change-Id: Ibbe2eb88d384bf1b713ec2a95b12940b3d6d2572
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
2 files changed