tests: Fix syntax error building images
tests: Use consistent naming for image path constants
Pass DB to converters
Drivers in returned XML become options

Option values have descriptive text
tests: Add construction test for Package
Add EVR contstruction to Package
redhat: NFC Tidy up initialisation of info
db: Cleanup headers and 1 duplicate entry in default XML
Remove accidentally committed oz test output
tests: Allow local template substitutions to be stored in local.props
Add a qxl capability
examples: No user-custom capability
examples: No update-method option
examples: option key attribute becomes 'name'
Refactor returned converter options
redhat: Fix syntax error on failure to find yum package
redhat: Ensure Installer._installer is always initialised
redhat: Improve logging of yum transactions
redhat: Add capability checking. Check for virtio, qxl, and cirrus
tests: Remove redundant skipUnless