Resolve ovnkube node encap IP in startup script

[SchSeba]

Teach the ovnkube node wrapper to derive --encap-ip from /etc/ovnk/encap_interface, including host-mounted lookups and dual-stack addresses, while allowing OVN_ENCAP_IP to override the resolved value for per-node configuration.

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This pull-request has been approved by: SchSeba
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