SSL: adopted session ticket handling for OpenSSL 1.1.0. Return 1 in the SSL_CTX_set_tlsext_ticket_key_cb() callback function to indicate that a new session ticket is created, as per documentation. Until 1.1.0, OpenSSL didn't make a distinction between non-negative return values. See https://git.openssl.org/?p=openssl.git;a=commitdiff;h=5c753de for details.

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