The file /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-Debug-7 shipped with centos-release-7-0.1406.el7.centos.2.4 contains two keys, one being the CentOS 7 Official Signing Key and another the debug one (CentOS-7 Debuginfo RPMS).<br />
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As the main key is imported during the kickstart, rpm --import against the above file silently exits apparently because the first key is found in the rpm database and the second key is not imported too.
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