Use allow_early_data_cb from SSL instead of SSL_CTX

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9471)

(cherry picked from commit 59b2cb2638dda3e07385ad36a41f0e141b36987b)