test: fix concurrent_cmd_order_should_have_correct_revision blocking

[themanforfree]

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?) fix test
• what changes does this pull request make? fix test
• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc) no

[codecov[bot]]

Codecov Report

Attention: 127 lines in your changes are missing coverage. Please review.

Comparison is base (2feedc0) 75.23% compared to head (aadc8ac) 75.11%. Report is 7 commits behind head on master.

Files	Patch %	Lines
crates/utils/src/lib.rs	29.62%	16 Missing and 3 partials :warning:
crates/xline-client/src/lib.rs	34.48%	16 Missing and 3 partials :warning:
crates/xline/src/server/xline_server.rs	62.74%	14 Missing and 5 partials :warning:
crates/utils/src/config.rs	65.38%	17 Missing and 1 partial :warning:
crates/xlinectl/src/main.rs	0.00%	12 Missing :warning:
crates/curp/src/client/mod.rs	44.44%	6 Missing and 4 partials :warning:
crates/xline/src/utils/args.rs	0.00%	9 Missing :warning:
crates/curp/src/rpc/connect.rs	80.00%	1 Missing and 4 partials :warning:
crates/curp/src/server/curp_node.rs	69.23%	4 Missing :warning:
crates/curp/src/client/state.rs	83.33%	2 Missing and 1 partial :warning:
... and 5 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #643 +/- ## ========================================== - Coverage 75.23% 75.11% -0.13% ========================================== Files 158 158 Lines 23252 23393 +141 Branches 23252 23393 +141 ========================================== + Hits 17493 17571 +78 - Misses 4662 4718 +56 - Partials 1097 1104 +7 ```

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