cp: Avoid performing DNS queries on every healthcheck execution

This is achieved by targeting the realserver IP or the VIP depending on the forwarding plane:

  • Katran: VIP address is used
  • IPVS: realserver address is used

We cannot use the VIP with IPVS and IPIP cause we trigger a double encapsulation scenario as described on the phab task

This MR ships commits from !50 (merged), !51 (merged) and !52 (merged)

Closes T372731

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