Add Get / Set Dimm offset ipmi commands

Implement the commands, store data in json. Also push
setting to d-bus for dimm offset for dimms to use
to modify thresholds.

Tested:
set offsets using set command and data returned by
get was correct

Change-Id: I5ab2604ce11f5ecf49b01e352ce8c15be8eefb72
Signed-off-by: James Feist <james.feist@linux.intel.com>
2 files changed