refactor gateway bft test #2744

Job	Run time
Basic Checks	3m 22s
Unit Tests	5m 56s
Integration Tests (raft)	11m 37s
Integration Tests (pvtdata)	11m 25s
Integration Tests (pvtdatapurge)	5m 29s
Integration Tests (ledger)	12m 29s
Integration Tests (lifecycle)	4m 22s
Integration Tests (e2e smartbft)	19m 55s
Integration Tests (discovery gossip devmode pluggable)	5m 55s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 27s
Integration Tests (sbe nwo msp)	7m 19s
	1h 44m 16s

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