git: openjdk/jdk17u-dev: 8287007: [cgroups] Consistently use stringStream throughout parsing code

[Goetz Lindenmaier]

Changeset: 3aa85f9e
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-04-18 12:51:32 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/3aa85f9e256051fbc1207c296f0d6d1d2917769d

8287007: [cgroups] Consistently use stringStream throughout parsing code

Backport-of: e0baf012b111e422ddf39a577b1b4af2599fd00d

! src/hotspot/os/linux/cgroupV1Subsystem_linux.cpp
! src/hotspot/os/linux/cgroupV2Subsystem_linux.cpp
+ test/hotspot/gtest/runtime/test_os_linux_cgroups.cpp
+ test/jdk/jdk/internal/platform/cgroup/CgroupV1SubsystemControllerTest.java
+ test/jdk/jdk/internal/platform/cgroup/CgroupV2SubsystemControllerTest.java