Flaky bpf cg_storage_* tests

[Martin KaFai Lau <martin.lau@xxxxxxxxx>]

Hi YiFei and Stan, it is observed that the cg_stroage_* tests fail from time to 
time. A recent example is 
https://github.com/kernel-patches/bpf/actions/runs/4543867424/jobs/8009943115?pr=3924

Could you help to take a look? may be run it under netns and also have better 
filtering by ip/port when counting packets?

Thanks!