add docs for smartbft metrics (#4434) #66

Job	Run time
Basic Checks	3m 11s
Unit Tests	5m 40s
Integration Tests (raft)	11m 33s
Integration Tests (pvtdata)	18m 6s
Integration Tests (pvtdatapurge)	4m 27s
Integration Tests (ledger)	15m 8s
Integration Tests (lifecycle)	10m 52s
Integration Tests (e2e smartbft)	19m 30s
Integration Tests (discovery gossip devmode pluggable)	5m 27s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	9m 23s
Integration Tests (sbe nwo msp)	8m 24s
	1h 51m 41s

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