refactor gateway bft test #2748

Job	Run time
Basic Checks	3m 9s
Unit Tests	5m 41s
Integration Tests (raft)	11m 45s
Integration Tests (pvtdata)	10m 50s
Integration Tests (pvtdatapurge)	5m 10s
Integration Tests (ledger)	12m 6s
Integration Tests (lifecycle)	4m 16s
Integration Tests (e2e smartbft)	20m 15s
Integration Tests (discovery gossip devmode pluggable)	6m 8s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 17s
Integration Tests (sbe nwo msp)	6m 58s
	1h 42m 35s

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