Get BMC system model based on the device tree population.

This changes the following:
    - Added a "Get BMC System Model" keyword in utils.robot

Resolves openbmc/openbmc-test-automation#332

Change-Id: Iedea5e4badc8e1a4bd635e7f2a6d797c902e1787
Signed-off-by: Sivas SRR <sivas.srr@in.ibm.com>
2 files changed