test: Simplify fragment tracking test
test: Simplify fragment tracking test

The fragment tracking test sends a couple fragments to a K8s service and
checks the ctmap content to ensure they were properly sent and received.
It used to filter based on the 4-tuple. That is however making the test
convoluted when adding support for kube-proxy to the test (new commit).

This commit therefore switches to filtering based on the 3-tuple (source
port, destination IP and port). Support for sending from k8s2 is also
removed since it wasn't used.

Signed-off-by: Paul Chaignon <a027184a55211cd23e3f3094f1fdc728df5e0500@cilium.io>

cilium/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,cilium-team/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,cilium-team/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium