Mac addresses in input flow should be handled irrespective of case

Mac addresses in input flow should be handled irrespective of upper/lowercase.
If lowercase are used in mac addresses, it is converted to uppercase and listed as unmatched flow in Operational flows.

For eg: if input mac address is aa:bb:cc:aa:bb:cc , it is converted as AA:BB:CC:AA:BB:CC and listed as unmatched flow in operational flows.