services/fs: Implement proposal 11-error-handling

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

[Xuanwo]

Here is an overview of what got changed by this pull request:

Clones added
============
- services/qingstor/storager.go  7
         

Clones removed
==============
+ services/fs/utils_test.go  -1
+ services/fs/storager.go  -5
         

See the complete overview on Codacy

[codecov]

Codecov Report

Merging #141 into master will increase coverage by 0.42%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   85.54%   85.97%   +0.42%     
==========================================
  Files          12       12              
  Lines         955      984      +29     
==========================================
+ Hits          817      846      +29     
  Misses         86       86              
  Partials       52       52

Impacted Files	Coverage Δ
services/qingstor/storager.go	82.11% <ø> (ø)	⬆️
services/fs/utils.go	92% <100%> (+0.69%)	⬆️
services/fs/storager.go	89.52% <88.67%> (+1.72%)	⬆️

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