allow overriding calico peers names and avoid ipv6 naming issues

[cristicalin]

What type of PR is this?
/kind feature

What this PR does / why we need it:
There is an issue with using IPv6 address in the calico peer names which does not allow using :. This PR allows the deployer to specify a custom name in the peers structure for each peer as well as sanitises any IPv6 address in the name by replacing : with - that is allowed by the calico validation regex.

Which issue(s) this PR fixes:

Fixes #7585

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Calico: allow specifying overriding BGP peer name

[k8s-ci-robot]

Hi @cristicalin. Thanks for your PR.

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[champtar]

/lgtm

[champtar]

/ok-to-test

[floryut]

Nice 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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