support externalIPs of loadbalancer type for istio

[JaehoonHyun]

Description

• When externalIPs of service which is loadbalancer type created, external-dns doesn't support for istio-gateway, istio-virtualservice.

Checklist

• Unit tests updated
• End user documentation updated

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: JaehoonHyun
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[linux-foundation-easycla]

• ❌ - login: @jaehoon-prestolabs / name: Jaehoon Hyun . The commit (ce9c7ab) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[k8s-ci-robot]

Welcome @JaehoonHyun!

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[mloiseleur]

@JaehoonHyun In order for this PR to reviewed, you need to approve the CLA first.

[JaehoonHyun]

@JaehoonHyun In order for this PR to reviewed, you need to approve the CLA first.

I did do that

[mloiseleur]

@JaehoonHyun You should probably try again. EasyCLA check is red.

[JaehoonHyun]

Yeah I have a problem. I will reopen. This PR is closed

[JaehoonHyun]

@JaehoonHyun You should probably try again. EasyCLA check is red.

#3720

please check here