eUPF in ULCL scenario don't resolve ARP for ancor UPFs

As described in #456 (comment) overcome approach needed for traffic to go throught eUPF to next UPF in ULCL scenario with N9 interfaces.

we need to open eupf shell and start pinging both upf1 and upf2

My proposed solution is to add GTP Path management feature. eUPF have to send GTP Echo Request to every known GTP peer.

Simple GTP Path management option implemented:

Every peer should be configured to be monitored (see gtp_peer config option)
eUPF for each configured peer every echo_interval seconds send GTP Echo request and wait for an response
If no response - drop a line in log file

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