Fix potential deadlock in `jdk.jpackage.test.Executor.runExecutable()`: read subprocess's output streams concurrently in separate threads instead of reading them sequentially from the same thread.
This change required updating some test cases in the corresponding unit test. ------------- Commit messages: - Fix WinResourceTest deadlock Changes: https://git.openjdk.org/jdk/pull/28872/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28872&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8373887 Stats: 42 lines in 2 files changed: 38 ins; 0 del; 4 mod Patch: https://git.openjdk.org/jdk/pull/28872.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/28872/head:pull/28872 PR: https://git.openjdk.org/jdk/pull/28872
