fix(tests): TestDebugPrintLoadTemplate use assert.Regep instead of assert.Equal

[easonlin404]

Sometimes travis will build error because TestDebugPrintLoadTemplate templates print-order not guaranteed.

travis ref:

• https://travis-ci.org/gin-gonic/gin/jobs/249505506
• https://travis-ci.org/gin-gonic/gin/jobs/249296346
• https://travis-ci.org/gin-gonic/gin/jobs/249505506

[codecov]

Codecov Report

Merging #973 into master will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #973      +/-   ##
==========================================
+ Coverage   96.24%   96.38%   +0.14%     
==========================================
  Files          16       16              
  Lines        1410     1410              
==========================================
+ Hits         1357     1359       +2     
+ Misses         41       40       -1     
+ Partials       12       11       -1

Impacted Files	Coverage Δ
context.go	96.27% <0%> (+0.62%)	⬆️

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