In aync replication duplicate messages don't increase msgDrop counter

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Issue

When replication exchange detects duplicated messages, it 1) discards them, and 2) as for any other message, it increases msgIn and byteIn counters of replication-exchange. But msgDrop and byteDrop counters are not updated, though the messages were discarded.

Environment

MRG Messaging 2.0
MRG Messaging 2.1
MRG Messaging 2.2

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