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For etcdv2 and consul we keep using libkv while for etcd v3 api we'll directly
use the etcdclientv3. We abstract the implementation under a KVStore and an
Election interface. We haven't implemented a libkv store for etcdv3 since libkv
looks quite dead and doesn't support the context package. So in future we'll
probably move out from libkv to better use context features.
Note: currently semaphore isn't testing with etcdv3 api.