SUSE-SU-2016:0723-1 Security update for libssh2_org

This update for libssh2org fixes the following issues: - Add SHA256 support for DH group exchange fate320343, bsc961964 - fix CVE-2016-0787 bsc967026 Weakness in diffie-hellman secret key generation lead to much shorter DH groups then needed, which could be used to retrieve server keys...