This is needed for lorax parity. When multiple blueprints are being frozen in
toml mode, the API returns an error. This is the same behaviour as in the
/blueprints/info route.
Fixes#667
Two image types compare equal if they are named the same, and so are
their respective architectures and distros.
Signed-off-by: Tom Gundersen <teg@jklm.no>
The helper functions in both api packages were more or less same. However,
over time they have been slowly diverging. This commit extract the helpers
into one common package to make the tests more maintainable and
to deduplicate the code.
