QBFT: prevent maximum request timeout overflow #1098

Job	Run time
Unit tests in ubuntu-20.04	27m 42s
Build Docker image	3m 2s
Code linters	3m 39s
Run PEEPS tests	10m 13s
Acceptance tests (basic \|\| basic-raft \|\| (advanced && raft) \|\| networks/typical::raft)	19m 47s
Acceptance tests (basic \|\| basic-istanbul \|\| (advanced && istanbul && !block-heights) \|\| networks/typical::istanbul)	23m 18s
Acceptance tests (basic \|\| basic-istanbul \|\| (advanced && istanbul && !block-heights) \|\| empty-block-period \|\| block-reward \|\| networks/typical::qbft)	22m 6s
Acceptance tests (validator-management && networks/template::istanbul-3plus1)	8m 28s
Acceptance tests (validator-management && networks/template::qbft-3plus1)	9m 14s
Acceptance tests (multitenancy && networks/plugins::raft-multitenancy)	37s
Acceptance tests (migration && networks/template::istanbul-4nodes)	6m 33s
Acceptance tests (migration && networks/template::raft-4nodes)	3m 57s
Acceptance tests (basic \|\| networks/typical::raftmps)	16m 1s
Acceptance tests (basic \|\| networks/typical::istanbulmps)	21m 58s
Acceptance tests (basic \|\| networks/typical::qbftmps)	21m 16s
	3h 17m 51s

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