Support remote resources for kustomize edit add

[kzwang]

Fixes #2208

[k8s-ci-robot]

Hi @kzwang. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kzwang
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You can assign the PR to them by writing /assign @liujingfang1 in a comment when ready.

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[kzwang]

/assign @Liujingfang1

[monopole]

/ok-to-test

[monopole]

/lgtm

Great job on the test with the fakeloader!