RFR: 8367976: Validate and clamp jdk.httpclient.bufsize [v3]

[Volkan Yazici]

> Validate and clamp the value populated from the `jdk.httpclient.bufsize` system property. Added two new tests: Does clamping work? Does the minimum value wedge the client?

Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:

  Apply property doc suggestion
  
  Co-authored-by: Daniel Fuchs <67001856+dfuch at users.noreply.github.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27874/files
  - new: https://git.openjdk.org/jdk/pull/27874/files/148d4268..0cd7deef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27874&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27874&range=01-02

  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27874.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27874/head:pull/27874

PR: https://git.openjdk.org/jdk/pull/27874