tarantool / go-storage / 26094001569

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driver/etcd: add concurrency-based Locker

Locker wraps concurrency.NewSession + concurrency.NewMutex, which
require the concrete *etcd.Client. NewLocker type-asserts the stored
Client to *etcd.Client; drivers built with a non-concrete Client return
locker.ErrUnsupported. Example uses LazyCluster.

Builds on the locker package (see preceding commit).

Part of #29

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