fix create envelope seek info for bft blocksprovider #239

Job	Run time
Basic Checks	1m 10s
Unit Tests	5m 59s
Integration Tests (pvtdata)	14m 36s
Integration Tests (raft)	12m 56s
Integration Tests (pvtdatapurge)	4m 2s
Integration Tests (sbe nwo msp)	8m 28s
Integration Tests (e2e smartbft)	27m 5s
Integration Tests (discovery gossip devmode pluggable)	10m 38s
Integration Tests (lifecycle)	11m 13s
Integration Tests (ledger)	14m 39s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	7m 19s
	1h 58m 5s

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