HoldTillRename: Rename knative-sandbox to knative-extensions

[davidhadas]

This is an auotmated PR to replace strings to . Do not merge until Rename knative-sandbox org is renamed to knative-extensions

[knative-prow]

@davidhadas: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
unit-tests_infra_main	90f2d23	link	true	/test unit-tests
build-tests_infra_main	90f2d23	link	true	/test build-tests

Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[upodroid]

/hold

You'll need to update this closer to the cut-over date on the 1st of Aug

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidhadas, upodroid

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [upodroid]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[knative-prow-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[upodroid]

Can you rebase this PR please? We cut a new release of knative so some files have been renamed