Follow-up: service ports name following istio-naming convention

[iamejboy]

To be on safer side when using hand in hand with Istio, we follow service port naming convention as stated here ->https://istio.io/docs/setup/kubernetes/additional-setup/requirements/
Serving/Eventing already updated.

We have seen issue with istio as been discussed over here -> istio/istio#14520

Fixes #

Proposed Changes

• Service port name should follow the istio naming convention based on this link:

https://istio.io/docs/setup/kubernetes/additional-setup/requirements/

Release Note

* Service port name should follow the istio naming convention based on this link:
https://istio.io/docs/setup/kubernetes/additional-setup/requirements/

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[knative-prow-robot]

Hi @iamejboy. Thanks for your PR.

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[iamejboy]

@googlebot I fixed it.

[matzew]

/ok-to-test

[googlebot]

CLAs look good, thanks!

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[matzew]

/lgtm
/approve

[knative-prow-robot]

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This pull-request has been approved by: iamejboy, matzew

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