git: openjdk/jdk17u-dev: 8298730: Refactor subsystem_file_line_contents and add docs and tests

[Goetz Lindenmaier]

Changeset: bb103d7d
Branch: master
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2025-04-03 11:39:29 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/bb103d7d0914f90e85eb5f87831ffef1de536072

8298730: Refactor subsystem_file_line_contents and add docs and tests

Reviewed-by: phh
Backport-of: 500c3c17379fe0a62d42ba31bdcdb584b1823f60

! src/hotspot/os/linux/cgroupSubsystem_linux.hpp
! src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp
! src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp
! src/hotspot/share/utilities/ostream.cpp
! src/hotspot/share/utilities/ostream.hpp
+ test/hotspot/gtest/os/linux/test_cgroupSubsystem_linux.cpp
! test/hotspot/gtest/runtime/test_os_linux_cgroups.cpp