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38f65e5a2e
We add the new direct failure detector to the list of services started in the Scylla process. To start the service, we need an implementation of `pinger` and `clock`. `pinger` is implemented using existing GOSSIP_ECHO verb. The gossip echo message requires the node's gossip generation number. We handle this by embedding the pinger implementation inside `gossiper`, and making `gossiper` update the generation number (cached inside the pinger class) periodically. `clock` is a simple implementation which uses `std::chrono::steady_clock` and `seastar::sleep_until` underneath. Translating `steady_clock` durations to `direct_failure_detector::clock` durations happens by taking the number of ticks. The service is currently not used, just initialized; no endpoints are added and no listeners are registered yet, but the following commits change that.