Reduce packet limit from 10*1024 to reasonable 600 since our phones
are basically wireless connected computers with less than 10Mbit
connections. Based on:

http://www.bufferbloat.net/projects/codel/wiki/Best_Practices_for_Benchmarking_CoDel_and_FQ_CoDel
Merge branch 'ak-4.2.2-codel' into ak-4.2.2-official-mainline