Revised test to check and close all of the streams used in the pipeline. The test now checks the content length and closes each stdout and stderr stream.
The previous technique to redirect stderr to stdout was ineffective because the fd/stream was still created in the parent process. Created [8291986](https://bugs.openjdk.org/browse/JDK-8291986) ProcessBuilder.redirectErrorStream(true) leaves error stream available to investigate ------------- Commit messages: - 8291760: PipelineLeaksFD.java still fails: More or fewer pipes than expected Changes: https://git.openjdk.org/jdk/pull/9905/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9905&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8291760 Stats: 13 lines in 2 files changed: 5 ins; 7 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/9905.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9905/head:pull/9905 PR: https://git.openjdk.org/jdk/pull/9905
