Open Stack

I've proposed a new Vim/PBM api in this blueprint for oslo.vmware:
https://review.openstack.org/#/c/99952/

This is just the base change. However, it is a building block for adding
a bunch of interesting new features, including:

* Robust caching
* Better RetrievePropertiesEx
* WaitForUpdatesEx
* Non-polling task waiting

It also gives us explicit session transactions, which are a requirement
for locking should that ever come to pass.

Please read and discuss. There are a couple of points in there on which
I'm actively soliciting input.

Matt
-- 
Matthew Booth
Red Hat Engineering, Virtualisation Team

Phone: +442070094448 (UK)
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