qapi/parser: assert object keys are strings

The single quote token implies the value is a string. Assert this to be
the case, to allow us to write an accurate return type for get_members.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20210519183951.3946870-8-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
1 file changed