In some user scenarious (like implementing DNS RR) it might be useful to bind on 0.0.0.0 but at the same time do not conflict with other services that are binded to the same ports. For that, we can specify a specific interface, on which haproxy will be binded to 0.0.0.0. In netstat it would be represented like `0.0.0.0%br-mgmt:5000`. With that we also allow to fully override `vip_binds` if assumtions that role make are not valid for some reason. Change-Id: Ic4c58ef53abc5f454b6fbebbd87292a932d173ae
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