[cluster] Fix a bug in shards.Clone() #3535
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What this PR does / why we need it:
shards.Clone()was adding the original shards to the clonedshardMapwithout making a copy of them.Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
NONE
Does this PR require updating code package or user-facing documentation?:
NONE