[#4237]Fix problems when scanning REST services with @RestController …

[liubao68]

…annotation

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 44.73%. Comparing base (eeacbec) to head (cbb98b6).

❗ Current head cbb98b6 differs from pull request most recent head 705fa69. Consider uploading reports for the commit 705fa69 to get more accurate results

Files	Patch %	Lines
...a/org/apache/servicecomb/swagger/SwaggerUtils.java	0.00%	4 Missing ⚠️
...tation/RestControllerClassAnnotationProcessor.java	0.00%	2 Missing ⚠️
...agger/generator/core/AbstractSwaggerGenerator.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4238      +/-   ##
============================================
+ Coverage     44.71%   44.73%   +0.01%     
- Complexity     5431     5433       +2     
============================================
  Files          1385     1385              
  Lines         34465    34466       +1     
  Branches       3332     3333       +1     
============================================
+ Hits          15412    15417       +5     
+ Misses        17811    17804       -7     
- Partials       1242     1245       +3     

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