Allow setting minProtocolVersion on istio gateways

General MR

Summary

This is a follow on to big-bang/product/packages/istio-controlplane#78 (closed) that exposes the minProtocolVersion for the gateways to allow easier config. Currently this is not possible without adding to the istio.values and duplicating a lot of values - see the issue for more details.

added community-contribution label

assigned to @micah.nagel

added istio statusreview labels

requested review from @ryan.thompson.44, @ryan.j.garcia, and @chris.oconnell

changed milestone to %2.4.0

approved this merge request

merged

mentioned in commit 11dd60f9