Fix live-image import/export

Corrected the spelling of ephemeral_gb to export the correct field.

Change-Id: I04087168841e86a47ea8351a3a3e94de7b2cdb7f
nova.exception has no class named Error

Change-Id: I4ab0503fcea0f975cf194ade9fea68d2eaf63a91
Fix: Imported live images should not be able to be terminated

disable_terminate was not set for imported instances

Change-Id: I9d41bc4ddd835644ad13890cfc552f0e85b7ce19
Policy distribution through nova.

Implementing functionality in cobalt to allow distribution of
vmspolicyd policies to all known vms hosts. The client takes a path to
a locally accessible policy file, and the contents of this file is
copied into all the policy definition files on all hosts. The compute
service does so basic validation on the provided definitions before
installing them.

Change-Id: I3506a00b9b65d7df6d0a9f878a2b99d0b5c1bbbf