Changelog:
=============
Fix bug with JSON schema for sequence of discriminated union
Fix schema references in discriminated unions
Fix json schema generation for recursive models
Fix models_json_schema for generic models
Fix xfailed test for generic model signatures
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
