Automated cherry pick of #949: Adds kfserving ingressgateway for Istio 1.1.6 Modifies Cherry pick of #949 on v1.0-branch. #949: Adds kfserving ingressgateway for Istio 1.1.6 Modifies

[richardsliu]

This change is 

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[richardsliu]

@krishnadurai Please verify consent for this PR.

[krishnadurai]

@googlebot I consent.

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[krishnadurai]

/lgtm

[krishnadurai]

/lgtm

[richardsliu]

/approve

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