SUSE-SU-2015:1518-1 Security update for gnutls

gnutls was updated to fix several security vulnerabilities. - fix double free in certificate DN decoding GNUTLS-SA-2015-3bsc941794,CVE-2015-6251 - fix invalid read in octet string in bundled libtasn1 bsc929414,CVE-2015-3622 - fix ServerKeyExchange signature issue GNUTLS-SA-2015-2bsc929690...