security update for dhcp

- Update to ISC dhcp-4.2.4-P2 release, providing a security fix for
an issue with the use of lease times was found and fixed. Making
certain changes to the end time of an IPv6 lease could cause the
server to abort. Thanks to Glen Eustace of Massey University,
New Zealand for finding this issue.
([ISC-Bugs #30281], CVE: CVE-2012-3955, bnc#780167)

Fixed bugs
CVE-2012-3955: dhcp: Reducing the expiration time for an IPv6 lease may cause the server to crash
Selected Binaries
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