[jdk17u-dev] RFR: 8308185: Update Http2TestServerConnection to use SSLSocket.startHandshake()

[Goetz Lindenmaier]

I would like to bring this small test improvement to 17.

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Commit messages:
 - Backport 1a6f9810cd5bcd3cdbdd1505900c0e8c7f091b22

Changes: https://git.openjdk.org/jdk17u-dev/pull/3854/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3854&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308185
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3854.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3854/head:pull/3854

PR: https://git.openjdk.org/jdk17u-dev/pull/3854