Update release notes for shenandoah-8u392-b08.
Sync the copy of the portable specfile with the latest update
Update generate_tarball.sh to be closer to upstream vanilla script inc. no more ECC removal
Update bug URL for RHEL to point to the Red Hat customer portal
Change top_level_dir_name to use the VCS tag, matching new upstream release style tarball
Regenerate PR2462 patch following JDK-8315135
Bump version of bundled libpng to 1.6.39
Add backport of JDK-8312489 heading upstream for 8u402 (see OPENJDK-2095)
Add missing JFR, alt-java, jre-* and java-* alternative ghosts
Move jcmd to the headless package
** This tarball is embargoed until 2023-10-17 @ 1pm PT. **
- Resolves: RHEL-12210
- Resolves: RHEL-13579
- Resolves: RHEL-13580
- Resolves: RHEL-13581
- Resolves: RHEL-11315
- Resolves: RHEL-13585
- Resolves: RHEL-2381
