[openstack-cloud-controller-manager] Remove enforcement of IPv6 LB as internal

[MaysaMacedo]

What this PR does / why we need it:

OpenStack does not provide NAT with IPv6, so it has no support for Floating IP with IPv6. But, IPv6 that uses GUAs don't require NAT to access the outside world, so IPv6 can be rechable without Floating IPs making the enforcement of IPv6 LB as internal not necessary. By removing this enforcement IPv6 load-balancers are now allowed to be shared between Services.

Which issue this PR fixes(if applicable): fixes #

Special notes for reviewers:

Release note:

NONE

[MaysaMacedo]

/hold

[k8s-ci-robot]

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[dulek]

/ok-to-test

[MaysaMacedo]

/hold cancel

[MaysaMacedo]

@dulek this is ready for another look, whenever possible.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dulek

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[jichenjc]

/lgtm