Add Servers section configuration for knative-ingress-gateway

[eqqe]

Fixes #160

[knative-prow-robot]

Hi @eqqe. Thanks for your PR.

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[houshengbo]

/ok-to-test

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: eqqe
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[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-serving-operator-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/knativeserving/common/gateway.go	100.0%	91.3%	-8.7

[jcrossley3]

In light of on-going work to abstract the various ingress impls, I'm hesitant to embed an Istio API into our CRD. See https://docs.google.com/document/d/1Kwy13f36aeBv8slYy2OkpSRE6OKkkk2nAldiEq49Ybg/edit

/hold

[k4leung4]

+1 to what @jcrossley3 said
While Istio is the common ingress option, embedding Istio API seems counter to what has been happening in the knative/serving where they are looking to pull out istio specific logic

[knative-prow-robot]

@eqqe: PR needs rebase.

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[aliok]

#302 might be the solution for this problem. I also don't think having Istio things in the CRD(s) is a good idea.