Exit is activated in the middle of unit tests

[dimalit]

When running unit tests of skaled that invovle consensus, consensus' exit flag seems to keep raised after exit of 1st test. It causes consensus to immediately exit at the beginning of 2nd test.

Tests that were used to reproduce: JsonRpcSuite.

[2023-05-30 14:46:44.268] [config] [info] ConsensusEngine: bootstrapping node
[2023-05-30 14:46:44.332] [config] [info] Version update history: 2.1.001
[2023-05-30 14:46:44.332] [config] [info] Bootstrapping consensus ...
[2023-05-30 14:46:44.332] [config] [info] Last committed block in consensus:0
[2023-05-30 14:46:44.332] [config] [info] Last committed block in skaled:0
[2023-05-30 14:46:44.332] [config] [info] Check the consensus database for corruption ...
[2023-05-30 14:46:44.332] [config] [info] Jump starting the system with block:0
[2023-05-30 14:46:44.332] [config] [trace] Save price for block0
[2023-05-30 14:48:21.723] [config] [info] Exiting on block boundary for block 0```