Update MACAddress to find dynamically for validation
Update MACAddress to find dynamically for validation

Changes:
   - Get active eth channel name and get the redfish eth path
     for MACAddress and validate.

Change-Id: I83ad306cb32a23e6254e97ba8a84ed4e8b3dc957
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

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