Support KTLS on connections using BIO_TYPE_CONNECT.

Support KTLS on connections using BIO_TYPE_CONNECT.

This requires duplicating the KTLS changes from bss_sock.c in
bss_conn.c.  One difference from BIO_TYPE_SOCKET is that the call to
ktls_enable is performed after the socket is created in BIO_socket
rather than BIO_new_connect.

Some applications such as 'openssl s_time' use connect BIOs instead of
socket BIOs.  Note that the new connections created for accept BIOs
use BIO_TYPE_SOCKET via BIO_new_socket, so bss_acpt.c does not require
changes.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from https://github.com/openssl/openssl/pull/10489)