improve error message

[dzcvxe]

What type of PR is this?

/kind good-first-issue
/kind feature

What this PR does / why we need it:
When unit tests failed, we need to search the keyword fail to find out the failed cases, but there are many error messages that include keyword fail, this will affect our efficiency in finding failed cases.

Which issue(s) this PR fixes:
Fixes #1781

[openyurt-bot]

Welcome @dzcvxe! It looks like this is your first PR to openyurtio/openyurt 🎉

[rambohe-ch]

/rerun

[rambohe-ch]

/rerun

[rambohe-ch]

@dzcvxe Thank for very much, it is a good job.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[rambohe-ch]

/rerun

[rambohe-ch]

/rerun

[codecov]

Codecov Report

Attention: 363 lines in your changes are missing coverage. Please review.

Comparison is base (3636ec0) 52.23% compared to head (a9cc938) 52.23%.

Files	Patch %	Lines
pkg/yurthub/storage/disk/storage.go	0.00%	29 Missing ⚠️
pkg/yurthub/yurtcoordinator/coordinator.go	0.00%	26 Missing ⚠️
pkg/yurthub/cachemanager/cache_manager.go	31.42%	24 Missing ⚠️
...publicservice/gateway_public_service_controller.go	0.00%	14 Missing ⚠️
...troller/nodelifecycle/node_lifecycle_controller.go	0.00%	13 Missing ⚠️
pkg/yurttunnel/trafficforward/dns/dns.go	23.52%	13 Missing ⚠️
...n/gatewaypickup/gateway_pickup_enqueue_handlers.go	0.00%	12 Missing ⚠️
pkg/yurthub/storage/etcd/keycache.go	25.00%	9 Missing ⚠️
...yurthub/yurtcoordinator/certmanager/certmanager.go	10.00%	9 Missing ⚠️
pkg/yurttunnel/server/anpserver.go	0.00%	9 Missing ⚠️
... and 60 more

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1792   +/-   ##
=======================================
  Coverage   52.23%   52.23%           
=======================================
  Files         172      172           
  Lines       20840    20840           
=======================================
  Hits        10885    10885           
  Misses       8998     8998           
  Partials      957      957           

Flag	Coverage Δ
unittests	52.23% <7.86%> (ø)

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[YTGhost]

/lgtm

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dzcvxe, rambohe-ch, YTGhost

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• OWNERS [rambohe-ch]

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