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stubserver: support xds-enabled grpc server #7613
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| Codecov ReportAttention: Patch coverage is  
 
 Additional details and impacted files@@            Coverage Diff             @@
##           master    #7613      +/-   ##
==========================================
- Coverage   82.01%   81.84%   -0.18%     
==========================================
  Files         361      361              
  Lines       27813    27817       +4     
==========================================
- Hits        22812    22767      -45     
- Misses       3822     3853      +31     
- Partials     1179     1197      +18     
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                internal/stubserver/stubserver.go
              
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| // StoppableServiceRegistrar is an interface that extends the grpc.ServiceRegistrar | ||
| // interface with additional methods to stop and gracefully stop the server. | ||
| type StoppableServiceRegistrar interface { | 
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How do you feel about calling this GRPCServer
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Done.
        
          
                internal/stubserver/stubserver.go
              
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      |  | ||
| handler, ok := ss.S.(interface{ http.Handler }) | ||
| if !ok { | ||
| return fmt.Errorf("server of type %T does not implement http.Handler", ss.S) | 
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panic instead?  This is a programming error?
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Switched to panic. The ServeHTTP method is only supported by the grpc.Server and not by the xds.GRPCServer, but I think it's fine to panic here since tests shouldn't be trying to server HTTP using an xds-enabled grpc server.
Addresses #7291
RELEASE NOTES: none