Implement and test ipv6 native connectivity in RDU3

CentOS Infra issue/request

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Description

We had native ipv6 connectivity in RDU2 DC, and we'd like to enforce its usage too for new RDU3 DC. Discussing with Red Hat IT network team to ensure we have a policy that would reflect allowed ports directly for ipv4/ipv6 connectivity when asking for ports to be open/allowed through Firewall.

We need also to document this at our side, track fixed ipv6 addresses (no SLAC in that zone) and test ingress/egress ipv6 connectivity