[jdk11u-dev] RFR: 8254997: Remove unimplemented OSContainer::read_memory_limit_in_bytes

[Severin Gehwolf]

Clean backport removing an unimplemented left-over after the cgroups v2 support patches.

-------------

Commit messages:
 - Backport 5b51085c986fed342a9bc03f3641283707a89a4e

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/948/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=948&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254997
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/948.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/948/head:pull/948

PR: https://git.openjdk.java.net/jdk11u-dev/pull/948