Add an in memory implementation of cluster/client.Client #2219
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What this PR does / why we need it:
This adds a small testing utility to back a
cluster/client.Client
with an in-memory kv.Store. We have thecluster/kv/mem
implementation of kv.Store, but there's currently no way to back acluster/client.Client
with it. Construction of the kv.Store is tightly coupled with etcd in the current class; having a separate class seemed like a reasonable way to do this given the current code, but we could consider a more dependency injection style for that--let me know if you want to hash that out.Special notes for your reviewer:
Does this PR require updating code package or user-facing documentation?: