DS-4992 - Fix race in mongoServer.Close() #40
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As discussed here @charlievieth noted a race condition.
Close()attempts to copy state it wants while under lock, only to then release the lock and close underlying sockets. However, concurrent code paths may reachremoveSocket()and cause modification of the slices which were't copied (only aliased) while the lock was held.By making an actual copy under the lock, we avoid this problem without adding additional complexity.