add an example and test case for same class/interface name

[liubao68]

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[codecov-io]

Codecov Report

Merging #2093 (e793e57) into master (cbd4c57) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #2093      +/-   ##
============================================
+ Coverage     81.54%   81.56%   +0.02%     
- Complexity     1327     1329       +2     
============================================
  Files          1442     1443       +1     
  Lines         39501    39507       +6     
  Branches       3353     3353              
============================================
+ Hits          32210    32225      +15     
+ Misses         5825     5817       -8     
+ Partials       1466     1465       -1     

Impacted Files	Coverage Δ	Complexity Δ
.../servicecomb/demo/pojo/client/TestSameService.java	100.00% <100.00%> (ø)	2.00 <2.00> (?)
...mb/serviceregistry/client/http/RestClientUtil.java	75.70% <0.00%> (-1.87%)	0.00% <0.00%> (ø%)
...egistry/client/http/ServiceRegistryClientImpl.java	70.87% <0.00%> (+0.77%)	0.00% <0.00%> (ø%)
...mb/serviceregistry/task/MicroserviceWatchTask.java	70.00% <0.00%> (+1.66%)	0.00% <0.00%> (ø%)
...ervicecomb/foundation/vertx/tcp/TcpConnection.java	86.48% <0.00%> (+2.70%)	0.00% <0.00%> (ø%)
...rviceregistry/client/http/WebsocketClientUtil.java	77.19% <0.00%> (+3.50%)	0.00% <0.00%> (ø%)
...cecomb/serviceregistry/task/ServiceCenterTask.java	89.79% <0.00%> (+6.12%)	0.00% <0.00%> (ø%)

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