apply new error type to enforcer,model,config...

[GopherJ]

No description provided.

[GopherJ]

try to resolve #24

[GopherJ]

@hsluoyz @xcaptain could you review it?

[codecov]

Codecov Report

Merging #39 into master will increase coverage by 1.53%.
The diff coverage is 82.19%.

@@            Coverage Diff            @@
##           master     #39      +/-   ##
=========================================
+ Coverage   85.16%   86.7%   +1.53%     
=========================================
  Files          12      12              
  Lines        1861    1895      +34     
=========================================
+ Hits         1585    1643      +58     
+ Misses        276     252      -24

Impacted Files	Coverage Δ
src/error.rs	0% <0%> (ø)
src/rbac/default_role_manager.rs	92.55% <0%> (-0.44%)	⬇️
src/rbac_api.rs	85.26% <100%> (+0.76%)	⬆️
src/management_api.rs	90.47% <100%> (ø)	⬆️
src/adapter/file_adapter.rs	50% <16.66%> (-3.49%)	⬇️
src/enforcer.rs	85.19% <73.42%> (+10.67%)	⬆️
src/config.rs	84.86% <80%> (+1.2%)	⬆️
src/model.rs	94.52% <91.9%> (-0.02%)	⬇️

---

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[hsluoyz]

lgtm