Summary: ported TenantDataIsolation to Dragonwell

Test Plan: jdk/test/multi-tenant

Reviewed-by: yuleil, superajun-wsj

Issue: https://github.com/alibaba/dragonwell8/issues/84

Summary: add ExtendedPlatformComponent
Reviewed-by: dfuchs

Summary: Cleanup of javadoc -Xlint errors
Reviewed-by: lancea, mduigou, darcy, mullan, mchung

Reviewed-by: darcy
Contributed-by: serguei.spitsyn@oracle.com

Reviewed-by: mchung, jbachorik

Reviewed-by: alanb, mchung, darcy, jrose, ahgross, skoivu

Reviewed-by: alanb, dholmes, dsamersoff, sspitsyn, psandoz

Reviewed-by: dholmes, sla

Reviewed-by: mchung
Contributed-by: NJon VanAlten <jon.vanalten@redhat.com>

Reviewed-by: dholmes

Reviewed-by: alanb

Reviewed-by: darcy, lancea, alanb, briangoetz, mduigou, mchung

Reviewed-by: darcy, weijun

Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

Summary: Add new methods in ManagementFactory class to obtain platform MXBeans
Reviewed-by: alanb, dfuchs, emcmanus