Release Notes 6.0 -- New Partner Features and Pluggable Architecture

The following new features are covered within this CR:

* NSX+vCenter

* Ceilometer for vCenter

* Pluggable Acrhitecture

* Sahara for vCenter

* Glance+VMDK

* VLAN manager for vCenter hv

Change-Id: Ica825fcef96ab78a50ce847289ef2de1f39e2792
Merge "Release Notes 6.0 -- New Partner Features and Pluggable Architecture"