extend leap-util logs for smoke test

[dimas1185]

resolves #1348

here is my test logs:

leap-util block-log --blocks-dir /home/dima/work/leap/build/unittests/snapshots/prod_sched  smoke-test

Smoke test of blocks.log and blocks.index in directory "/home/dima/work/leap/build/unittests/snapshots/prod_sched"
info  2023-10-02T23:37:54.770 leap-util block_log.cpp:1583            smoke_test           ] block log version= 2
info  2023-10-02T23:37:54.770 leap-util block_log.cpp:1584            smoke_test           ] first block= 1
info  2023-10-02T23:37:54.770 leap-util block_log.cpp:1585            smoke_test           ] last block= 5
error 2023-10-02T23:37:54.771 leap-util subcommand.cpp:10             print_exception      ] 3190000 block_log_exception: Block log exception
/home/dima/work/leap/build/unittests/snapshots/prod_sched/blocks.log says it has 5 blocks which disagrees with 4 indicated by /home/dima/work/leap/build/unittests/snapshots/prod_sched/blocks.index
    {"block_file_name":"/home/dima/work/leap/build/unittests/snapshots/prod_sched/blocks.log","log_num_blocks":5,"index_num_blocks":4,"index_file_name":"/home/dima/work/leap/build/unittests/snapshots/prod_sched/blocks.index"}
    leap-util  block_log.cpp:350 validate_index