Integration tests for device role tagging

This adds an API test that tests device role tagging. It boots an
instance with tagged network interfaces and block devices and makes
sure that the tags appear correctly in the metadata, both via the API
and in the configdrive.

Change-Id: Ica92b771fc04891ad231967470f8b0ade7d2dead
Implements blueprint virt-device-role-tagging
3 files changed