second part of supporting istio egress gateways #2554

Job	Run time
unit-tests	20s
lint	10s
test-docker	36s
build_package	22s
calico-tests	1m 57s
calico-tests-orig-vs-opt-comparison	47s
fw-rules-assertion-tests	45s
istio-tests	1m 8s
istio-tests-orig-vs-opt-comparison	1m 5s
k8s-tests	1m 32s
k8s-tests-orig-vs-opt-comparison	2m 12s
test-docker-ubi	57s
test_package	12s
	12m 3s

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