RFR: 8277459: Add jwebserver tool [v3]

[Julia Boes]

> This change introduces jwebserver, a dedicated JDK tool for the Simple Web Server. 
> 
> A description is provided in a follow-up comment.

Julia Boes has updated the pull request incrementally with one additional commit since the last revision:

  fix whitespace error, add missing code tag

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6497/files
  - new: https://git.openjdk.java.net/jdk/pull/6497/files/513c5a1a..60acea9d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6497&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6497&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6497.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6497/head:pull/6497

PR: https://git.openjdk.java.net/jdk/pull/6497