envoy: Update integration test.
envoy: Update integration test.

Cilium integration test for Envoy is not run in the CI, so we've
failed to update it to match the Envoy sources we use as a
dependency. Update the integration test so that it passes in manual
tests.

Signed-off-by: Jarno Rajahalme <0f1ab0ac7dffd9db21aa539af2fd4bb04abc3ad4@covalent.io>

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