json: Add information about revocation keys to key list result
* src/gpgme-json.c (revocation_key_to_json): New. (key_to_json): Add list of revocation keys. * tests/json/Makefile.am (pubring-stamp): Import new pub key. * tests/json/key-with-revokers.asc: New. * tests/json/t-json.c (tests): Add "t-keylist-revokers". * tests/json/t-keylist-revokers.in.json, tests/json/t-keylist-revokers.in.json: New.
- GnuPG-bug-id: T7118