Previously it the `repo` schema didn't mark the `baseurl` property as
required, although Cloud API "technically" requires it and the builder
code also made assumptions about it being always provided.
Note on Cloud API:
Cloud API requires that at least one of `baseurl`, `metalink` or
`mirrorlist` is specified for a repo. Since the plugin schema specifies
only `baseurl` as a property, it is as a result mandatory in order for
the Cloud API request to be valid and succeed.
Mark `baseurl` property as required in the `repo` schema and add unit
test for it.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
68ee7eedbe