tests/qapi-schema: Make test-qapi.py -u work when files are absent

test-qapi.py -u updates the expected files.  Since it fails when they
are absent, users have to create them manually before they can use
test-qapi.py to fill in the contents, say for a new test.  Silly.
Improve -u to create them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210922125619.670673-3-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
1 file changed