Add support for network, boot_from_volume and volumes
Add support for network, boot_from_volume and volumes

nics is a great flexible parameter, but it's wordy. Shade now supports
a simple parameter too, which is just "network" and takes a name or id.
Add passthrough support.

In addition to supporting booting from a pre-existing volume, nova and
shade both support the concept of booting from volume based on an image.
Pass the parameters through.

Shade supports boot-time attachment of additional volumes for OpenStack
instances. Pass through the parameter so that ansible users can also
take advantage of this.

thaim/ansible,thaim/ansible