added note on SNI gotcha when Istio Gateway has hosts #9
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Description of changes: I found this example very useful but I was building a setup with multiple Istio Gateways configuring the same istio-proxy and matching the gateway by host worked initially until I switched to using TLS to prepare it for production and everything crumbled. Many nights later reading blogs and documentations it became clear that SNI forward was my issue. ALB Ingress does not forward the SNI to Istio so host-based matching cannot be used to select the gateway. So I think adding this note somewhere in here will help others.
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