optimize UnAssignIPForENI reduce unnecessary request

[l1b0k]

reduce unnecessary request

[codecov-io]

Codecov Report

Merging #145 (cc47d2e) into master (70111e2) will increase coverage by 0.15%.
The diff coverage is 45.00%.

@@            Coverage Diff            @@
##           master    #145      +/-   ##
=========================================
+ Coverage    6.43%   6.59%   +0.15%     
=========================================
  Files          39      40       +1     
  Lines        5312    5320       +8     
=========================================
+ Hits          342     351       +9     
+ Misses       4949    4948       -1     
  Partials       21      21              

Impacted Files	Coverage Δ
daemon/eni-multi-ip.go	0.00% <0.00%> (ø)
pkg/aliyun/ecs.go	0.00% <0.00%> (ø)
pkg/aliyun/utils.go	35.71% <62.50%> (+35.71%)	⬆️
pkg/aliyun/errors.go	100.00% <100.00%> (ø)

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