Test/sharding is failsafe

assigned to @gmoshkin

added 5 commits

• bf39c3a1 - 1 commit from branch master
• 65444759 - fix(sharding): turn on buckets discovery
• 110f2057 - fix(governor): used to synchronize with wrong commit index sometimes
• 769b6119 - test: support other kinds of call results
• d2473516 - test: bucket rebalancing respects replication factor

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merged