Fixes flakiness in traction test where the expectations for packets were later than the packet generating action.
Fixes flakiness in traction test where the expectations for packets were later than the packet generating action.

bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn