RFR: 8277459: Add jwebserver tool [v3]

[Michael McMahon]

On Wed, 24 Nov 2021 17:29:40 GMT, Julia Boes <jboes at openjdk.org> wrote:

>> 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

LGTM

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Marked as reviewed by michaelm (Reviewer).

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