Commit 8dd4554491 introduced a bug because
the output from osbuild is not captured. The problem is that osbuild
itself writes JSON document to STDOUT so two different JSON documents
are written to STDOUT: osbuild output and generated test case. The
generate-test-cases script then fails because it cannot json.loads() the
test case.
This patch simply supresses the output which fixes the issue.
1f580738db