fix premature timeout of rpc connection during test #7

Job	Run time
Basic Checks	1m 43s
Unit Tests	6m 51s
Integration Tests (raft)	11m 40s
Integration Tests (pvtdata)	10m 44s
Integration Tests (pvtdatapurge)	5m 3s
Integration Tests (ledger)	12m 48s
Integration Tests (lifecycle)	3m 48s
Integration Tests (e2e smartbft)	22m 35s
Integration Tests (discovery gossip devmode pluggable)	5m 27s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 3s
Integration Tests (sbe nwo msp)	6m 24s
	1h 43m 6s

Provide feedback