RFR: 8260923: Add more tests for SSLSocket input/output shutdown

[Abdul Kolarkunnu]

There is a lack of tests in the area of  java.net.Socket.shutdownInput() and java.net.Socket.shutdownOutput() , so added more tests in this area of with different TLS versions. Please review.

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Commit messages:
 - 8260923: Add more tests for SSLSocket input/output shutdown

Changes: https://git.openjdk.java.net/jdk/pull/2745/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2745&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260923
  Stats: 59 lines in 1 file changed: 37 ins; 13 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2745.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2745/head:pull/2745

PR: https://git.openjdk.java.net/jdk/pull/2745