update Packet UPI for Equinix Metal rename

[displague]

This is a documentation update for the Equinix Metal UPI (based on the Packet terraform provider). This PR only updates the text and links in the relevant README.md and install_upi.md.

[openshift-ci]

Hi @displague. Thanks for your PR.

I'm waiting for a openshift 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.

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[mtnbikenc]

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[jstuever]

/cc @staebler
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[staebler]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: staebler

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