jwt: add test for fetching JWKS via URL

Co-authored-by: Zoltan Chovan <zchovan@cloudera.com>

Change-Id: Ief272c813b62e789d747a88e1f3be8c406eed3f8
Reviewed-on: http://gerrit.cloudera.org:8080/18468
Tested-by: Alexey Serbin <alexey@apache.org>
Reviewed-by: Alexey Serbin <alexey@apache.org>
Reviewed-by: Wenzhe Zhou <wzhou@cloudera.com>
4 files changed