bugfix: fix jsonfile flaky test

[ZYecho]

Signed-off-by: zhangyue zy675793960@yeah.net

Ⅰ. Describe what this PR did

In the pr #2500 , I use channel to refactor the jsonfile test case, but bring a flaky test, this pr was to fix it.

Ⅱ. Does this pull request fix one issue?

None.

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

wait for CI

Ⅳ. Describe how to verify it

wait for CI

Ⅴ. Special notes for reviews

None.

[codecov]

Codecov Report

Merging #2540 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2540      +/-   ##
==========================================
- Coverage    69.2%   69.14%   -0.06%     
==========================================
  Files         278      278              
  Lines       18528    18528              
==========================================
- Hits        12822    12811      -11     
- Misses       4242     4254      +12     
+ Partials     1464     1463       -1

Flag	Coverage Δ
#criv1alpha1test	31.13% <ø> (-0.01%)	⬇️
#criv1alpha2test	35.39% <ø> (-0.03%)	⬇️
#integrationtest	40.46% <ø> (-0.17%)	⬇️
#nodee2etest	32.69% <ø> (-0.02%)	⬇️
#unittest	26.85% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
daemon/mgr/system.go	67.93% <0%> (-5.35%)	⬇️
daemon/mgr/snapshot.go	89.85% <0%> (-4.35%)	⬇️
ctrd/watch.go	77.46% <0%> (-4.23%)	⬇️
daemon/mgr/events.go	96.29% <0%> (-3.71%)	⬇️
ctrd/client.go	66.92% <0%> (-2.31%)	⬇️
daemon/mgr/container_utils.go	83.33% <0%> (-0.6%)	⬇️
daemon/mgr/container.go	58.47% <0%> (-0.43%)	⬇️
ctrd/container.go	58.81% <0%> (-0.4%)	⬇️
cri/v1alpha2/cri.go	70.18% <0%> (+0.75%)	⬆️
cri/v1alpha2/cri_wrapper.go	64.8% <0%> (+2.39%)	⬆️
... and 1 more

[fuweid]

LGTM wait for CI