Get/Set "Mangement Controller Identifier" string.
Get/Set "Mangement Controller Identifier" string.

Resolves openbmc/openbmc-test-automation#1208

Change-Id: I01c8dba33bf8d3cec7eed1ead8c28c69862e0df8
Signed-off-by: Sweta Potthuri <2dadfb5b6d383cf4af087a4abfaa582bcc4a300f@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation