tests: include major/minor version

The changeset that added BAMM output generator included major-version
and minor-version, that were missing from the parser.  They were
included as mandatory fields, so the rudimentary test failed.

(I would have squashed this change into the same changeset but they were
 already merged)

tests/input

@@ -1,4 +1,6 @@
 name: named_service
+major-version: 3
+minor-version: 0
 description: This is it.
 namespaces:
     - name: if