Core dump check introduction before and after code update.

This change addresses as follows:
     1. Core dump check introduction before and after code update
     2. Set core file size to unlimited after code update

Resolves openbmc/openbmc-test-automation#426

Change-Id: Iccaca5e6fc3c7a99b6758a0f44882fe816acc5e3
Signed-off-by: Sivas SRR <sivas.srr@in.ibm.com>
2 files changed