Fix to ignore multi-line warning messages so that stderr is empty
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - 8391886: Test serviceability/sa/sadebugd/DebugdConnectTest.java fails due to unexpected largepage warnings Changes: https://git.openjdk.org/jdk/pull/32770/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=32770&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8391886 Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/32770.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/32770/head:pull/32770 PR: https://git.openjdk.org/jdk/pull/32770
