second part of supporting istio egress gateways #2549

Job	Run time
calico-tests	1m 58s
build_package	27s
calico-tests-orig-vs-opt-comparison	52s
fw-rules-assertion-tests	46s
istio-tests	1m 7s
k8s-tests	1m 45s
istio-tests-orig-vs-opt-comparison	1m 14s
k8s-tests-orig-vs-opt-comparison	1m 56s
lint	13s
test-docker	32s
test-docker-ubi	56s
unit-tests	9s
test_package	11s
	12m 6s

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