Update 202-gateway.yaml to match Istio 1.0.2's istio.yaml.

[tcnghia]

Proposed Changes

Update knative-ingressgateway pods to match Istio 1.0.2's settings.

After #1963 is done we can proceed to #1969 which should allow us to move to using Istio's gateway pods by default so we don't have to keep doing this.

[tcnghia]

/assign @ZhiminXiang

[lichuqiang]

/lgtm

[tcnghia]

/assign @vaikas-google

[ZhiminXiang]

/lgtm
/approve

[vaikas]

and to double-check, you still want to leave the gateway at 1.0.1?

[tcnghia]

and to double-check, you still want to leave the gateway at 1.0.1?

@vaikas-google in their official release Istio still label their Helm chart 1.0.1 but the image tags are all updated to 1.0.2 (see Git tag 1.0.2 here https://github.com/istio/istio/blob/1.0.2/install/kubernetes/helm/istio/Chart.yaml) . Here I am keeping the chart label consistent with the upstream 1.0.2 manifest, only moving the image tag (also consistent with their 1.0.2 manifest)

[tcnghia]

@vaikas-google This PR also changes back the knative-ingressgateway Deployment from apps/v1 to extensions/v1beta1 (undoing one line in https://github.com/knative/serving/pull/2110/files). However since this is copied from Istio's templates I feel that it is best to keep things consistent with minimal changes.

/cc @lichuqiang

[vaikas]

/lgtm
/approve

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