fix: 🐛 try to fix goroutines exportEventsTimeout

[wind2008hxy]

What type of PR is this?
PR类型是什么？

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

bug

What this PR does / why we need it:
这个PR解决了什么问题:
try to fix goroutines exportEventsTimeout
尝试修复travis ci 测试过程报错

Which issue(s) this PR fixes:
PR相关联issue:

Fixes #

Does this PR introduce a breaking change?:
PR带来的破坏性变更:

None

Test/Final result:
测试/最终运行结果:

[codecov-commenter]

Codecov Report

Merging #108 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
- Coverage   50.97%   50.88%   -0.10%     
==========================================
  Files          27       27              
  Lines        1634     1637       +3     
==========================================
  Hits          833      833              
- Misses        729      732       +3     
  Partials       72       72              

Impacted Files	Coverage Δ
sinks/webhook/webhook.go	26.80% <0.00%> (-0.86%)	⬇️

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[wind2008hxy]

[wind2008hxy]

kube-eventer/sinks/manager_test.go

Line 35 in 548ea0a

manager.ExportEvents(&batch)

&batch实际是同一个内存地址，多个goroutines尝试读取的时候，实际会是多个goroutines顺序读取，猜测是这里导致超时。

[ringtail]

need rebase

[wind2008hxy]

rebase to one commit?

[ringtail]

rebase to one commit?

Yes

[wind2008hxy]

need rebase

rebase