tests: add filter to policy enforcement check functions
tests: add filter to policy enforcement check functions

Add filter to policy enforcement check functions so we are only checking for
status of relevant pods. In the event when kube-dns was restarted by
Kubernetes, kube-dns did show up as endpoint in `cilium endpoint list`,
which disrupts the check for number of endpoints being in a specific
desired state.

Signed-off by: Ian Vernon <ian@cilium.io>

cilium/cilium,tklauser/cilium,eloycoto/cilium,gumpt/cilium,scanf/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,gumpt/cilium,gumpt/cilium,tklauser/cilium,scanf/cilium,tgraf/cilium,gumpt/cilium,gumpt/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,gumpt/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,scanf/cilium,cilium-team/cilium,eloycoto/cilium,michi-covalent/cilium,scanf/cilium,eloycoto/cilium,tgraf/cilium,michi-covalent/cilium,eloycoto/cilium,cilium/cilium,tklauser/cilium,scanf/cilium,tgraf/cilium,eloycoto/cilium,cilium-team/cilium,eloycoto/cilium,scanf/cilium,gumpt/cilium