8170888: [linux] Experimental support for cgroup memory limits in container (ie Docker) environments
Summary: Set apparent physical memory to cgroup memory limit when UseCGroupMemoryLimitForHeap is true
Reviewed-by: acorn, gtriantafill
Contributed-by: NChristine Flood <chf@redhat.com>

Reviewed-by: dcubed, sspitsyn, gtriantafill

Summary: Use the initial active processor count for memory initialization instead of the current active one.
Reviewed-by: dholmes, mgerdin

Summary: Introduce and initialize active_processor_count variable in VM.
Reviewed-by: dholmes, jprovino

Reviewed-by: kevinw, vlivanov

Reviewed-by: mgronlun, alanb, dholmes

Reviewed-by: hseigel