Unbreakable Enterprise kernel security update

[2.6.39-400.297.6]

• l2tp: fix racy SOCK_ZAPPED flag check in l2tp_ip{,6}_bind() (Guillaume Nault) [Orabug: 26586050] {CVE-2016-10200}
• xfs: fix two memory leaks in xfs_attr_list.c error paths (Mateusz Guzik) [Orabug: 26586024] {CVE-2016-9685}
• KEYS: Disallow keyrings beginning with ‘.’ to be joined as session keyrings (David Howells) [Orabug: 26586002] {CVE-2016-9604}
• ipv6: fix out of bound writes in __ip6_append_data() (Eric Dumazet) [Orabug: 26578202] {CVE-2017-9242}