Remove 1.16.x hook on test packet_centos7-weave-kubeadm-sep and upgrade weave to 2.6.2

[floryut]

What type of PR is this?
/kind failing-test

What this PR does / why we need it:
Remove hook as weave is working, the only thing that was making it fail was #5910
/hold until 5910 is merged in master and rebased on this branch

Which issue(s) this PR fixes:
None

Special notes for your reviewer:
None

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @floryut. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Miouge1]

/ok-to-test

[Miouge1]

Thank you for tracking this down @floryut

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, Miouge1

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[Miouge1]

/retest