RFR: 8316031: SSLFlowDelegate should not log from synchronized block

[Daniel Fuchs]

The java/net/httpclient/HttpClientLocalAddrTest.java has been observed failing relatively frequently in timeout - and the log shows a Carrier thread being pinned.
Whether that's the root cause of the test failure is hard to say, but we should fix the code to avoid pinned threads. This is one path that had escaped my notice when I went through the HttpClient code before.

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Commit messages:
 - 8316031

Changes: https://git.openjdk.org/jdk/pull/15761/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15761&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316031
  Stats: 7 lines in 2 files changed: 2 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/15761.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15761/head:pull/15761

PR: https://git.openjdk.org/jdk/pull/15761