sysutils/logstash7: Update 7.17.11 => 7.17.29, deprecate

Release Notes:
https://www.elastic.co/guide/en/logstash/7.17/releasenotes.html

Improve port:

• Replace PORTVERSION with DISTVERSION.
• Add LOCAL/vvd/elastic to MASTER_SITES for those who can't download due to the HTTP error "Forbidden 403".
• Deprecate with date 2026-06-30 due to 7.x reached EoL on 15 Jan 2026.
• Limit JAVA_VERSION to supported 17, 11 and 8.
• Parametrize "logstash" with "${PORTNAME}".
• Adjust CONFLICTS.
• Add possibility to use custom user/group.
• Merge CHMODs.
• Fix white characters and remove unnecessary empty lines.
• Remove unnecessary MKDIR.

PR: 293746
Approved by: elastic (maintainer, implicit - inactive for more than 6 months)
MFH: 2026Q1

(cherry picked from commit f9a361fbda06dbe5ba5c009e79a446039899725f)