goroutine leak fixed (#5214) #4111

Job	Run time
Basic Checks	1m 49s
Unit Tests	14m 55s
Integration Tests (raft)	13m 7s
Integration Tests (pvtdata)	14m 13s
Integration Tests (pvtdatapurge e2e)	23m 15s
Integration Tests (ledger)	13m 43s
Integration Tests (lifecycle)	9m 5s
Integration Tests (smartbft)	23m 30s
Integration Tests (discovery gossip devmode pluggable)	10m 31s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	17m 13s
Integration Tests (sbe nwo msp)	10m 11s
	2h 31m 32s

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