Symptom: testTrafficStatsForLocalhost fails when applications or services except CTS are using network. Root cause: testTrafficStatsForLocalhost can't calculate the number of non-localhost packets for CTS. It includes the all of packets for applications/services except CTS and non-localhost packets for CTS. Solution: Remove this assertion and only logging the number of packets. Change-Id: I49243d59f359f3a543c6bdb46f6a2645cde8f292