[8u] RFR: 8170888: [linux] Experimental support for cgroup memory limits in container (ie Docker) environments

[David Holmes]

Please review this backport of the fix for 8170888, it can't apply 
cleanly due to use of unified logging, but that is the only change.

Original JDK 9 review thread: 
http://mail.openjdk.java.net/pipermail/hotspot-dev/2016-December/025516.html

Bug: https://bugs.openjdk.java.net/browse/JDK-8170888

JDK 9 changeset: 
http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/5f1d1df0ea49

8u webrev: http://cr.openjdk.java.net/~dholmes/8170888/webrev.8u/

Thanks,
David
-----