Security update for mozilla-nss

This update to mozilla-nss 3.20.2 fixes the following issues:

* CVE-2015-7575: MD5 signatures accepted within TLS 1.2 ServerKeyExchange in server signature (boo#952810)

Fixed bugs
bnc#959888
VUL-0: EMBARGOED: CVE-2015-7575: mozilla-nss: TLS 1.2 RSA-mD5 downgrade attack
Selected Binaries
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