second part of supporting istio egress gateways #2452

Job	Run time
calico-tests	2m 35s
fw-rules-assertion-tests	1m 1s
build_package	24s
calico-tests-orig-vs-opt-comparison	1m 4s
istio-tests	1m 37s
istio-tests-orig-vs-opt-comparison	1m 39s
k8s-tests	1m 52s
k8s-tests-orig-vs-opt-comparison	2m 49s
lint	14s
test-docker	50s
test-docker-ubi	37s
unit-tests	9s
test_package	13s
	15m 4s

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