code: @Override
      public ListSourceCredentialsResult listSourceCredentials(ListSourceCredentialsRequest request) {
          request = beforeClientExecution(request);
          return executeListSourceCredentials(request);
      }
docs: <p>
  Returns a list of <code>SourceCredentialsInfo</code> objects.
  </p>
  
  @param listSourceCredentialsRequest
  @return Result of the ListSourceCredentials operation returned by the service.
  @sample AWSCodeBuild.ListSourceCredentials
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/codebuild-2016-10-06/ListSourceCredentials"
  target="_top">AWS API Documentation</a>