RFR: 8298869: Update ConnectionTest.java for changes to TLS implementation

[Matthew Donovan]

* Updated the test for changes to the TLS implementation
* Test supports TLS 1.2 and 1.3
* Removed from ProblemList.txt
* Refactored code a bit

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Commit messages:
 - removed extra whitespace
 - 8298869: Update ConnectionTest.java for changes to TLS implementation

Changes: https://git.openjdk.org/jdk/pull/11871/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11871&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298869
  Stats: 512 lines in 2 files changed: 93 ins; 172 del; 247 mod
  Patch: https://git.openjdk.org/jdk/pull/11871.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11871/head:pull/11871

PR: https://git.openjdk.org/jdk/pull/11871