Add an option to ignore MAC addresses when other layer data could correlate a flow successfully.

**Describe the enhancement:**
If higher level data like IP addresses are available to match a flow, but the MAC addresses don't match, there should be an option to relax the requirement for the MACs to match in order to record the flow.

**Describe a specific use case for the enhancement or feature:**
For example when aggregating multiple links/interfaces, packets can have a different return route. In that situation, having the ability to ignore the MAC addresses would allow the flows to be constructed.