[jdk11u-dev] RFR: 8281274: deal with ActiveProcessorCount in os::Linux::print_container_info

[Matthias Baesken]

Please review the backport of 8281274; it needs slight adjustment to go into jdk11u-dev.

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Commit messages:
 - Backport bb2e10ccea0c0b89b06ace034c99253e9999ec47

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1031/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1031&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281274
  Stats: 16 lines in 2 files changed: 14 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1031.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1031/head:pull/1031

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1031