libzypp: security fixes in RPM GPG key import parsing

libzypp was adjusted to enhance the RPM GPG key import/handling to
avoid a problem with multiple key blobs.

Attackers able to supplying a repository could let the packagemanager
show another keys fingerprint while a second one was actually used to
sign the repository (CVE-2013-3704).

Fixed bugs
bnc#828672
VUL-1: CVE-2013-3704: libzypp may missinterpret gpg-pubkey data
Selected Binaries
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