Add a script command to enable Nova compute.instance.update
notifications on VM and task state changes.
Change-Id: I639f003d92e184085a332f53c6783e5eca0002fe
Use DevStack's plugin model to allow for developers to easily set up
the Watcher services within DevStack.
Provides documentation on how to use the plugin as well as documentation
on how to configure a multi-node DevStack installation to use. Also
provides an example local.conf for both the controller and compute
nodes.
Implements blueprint devstack-plugin
Change-Id: Ide663813f7a49d645877a21a0d1914be3218385e