caoxuewen created SPARK-23343:
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             Summary: Increase the exception test for the bind port
                 Key: SPARK-23343
                 URL: https://issues.apache.org/jira/browse/SPARK-23343
             Project: Spark
          Issue Type: Test
          Components: Spark Core
    Affects Versions: 2.4.0
            Reporter: caoxuewen


this PR add new test case, 
1、add the boundary value test of port 65535
2、add the privileged port to test,
3、add rebinding port test when set `spark.port.maxRetries` is 1,
4、add `Utils.userPort` self circulation to generating port,

in addition, in the existing test case, if you don't set the `spark.testing` 
for true, the default value for `spark.port.maxRetries` is not 100, but 16, 
(expectedPort + 100) is a little mistake.



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