refactor gateway bft test #2746

Job	Run time
Basic Checks	3m 8s
Integration Tests (raft)	12m 38s
Unit Tests	5m 33s
Integration Tests (pvtdata)	11m 41s
Integration Tests (pvtdatapurge)	5m 16s
Integration Tests (ledger)	12m 36s
Integration Tests (lifecycle)	4m 7s
Integration Tests (e2e smartbft)	20m 2s
Integration Tests (discovery gossip devmode pluggable)	5m 26s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 39s
Integration Tests (sbe nwo msp)	7m 27s
	1h 44m 33s

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