Security update for xen

This update for xen fixes several issues.

These security issues were fixed:

- CVE-2017-12135: Unbounded recursion in grant table code allowed a malicious
guest to crash the host or potentially escalate privileges/leak information
(XSA-226, bsc#1051787).
- CVE-2017-12137: Incorrectly-aligned updates to pagetables allowed for
privilege escalation (XSA-227, bsc#1051788).
- CVE-2017-12136: Race conditions with maptrack free list handling allows a
malicious guest administrator to crash the host or escalate their privilege to
that of the host (XSA-228, bsc#1051789).
- CVE-2017-11434: The dhcp_decode function in slirp/bootp.c allowed local guest
OS users to cause a denial of service (out-of-bounds read) via a crafted DHCP
options string (bsc#1049578).
- CVE-2017-10664: qemu-nbd did not ignore SIGPIPE, which allowed remote
attackers to cause a denial of service (daemon crash) by disconnecting during a
server-to-client reply attempt (bsc#1046637).
- CVE-2017-12855: Premature clearing of GTF_writing / GTF_reading lead to
potentially leaking sensitive information (XSA-230 bsc#1052686.

These non-security issues were fixed:

- bsc#1055695: XEN: 11SP4 and 12SP3 HVM guests can not be restored after the save using xl stack
- bsc#1035231: Migration of HVM domU did not use superpages on destination dom0
- bsc#1002573: Optimized LVM functions in block-dmmd block-dmmd

This update was imported from the SUSE:SLE-12-SP3:Update update project.

Fixed bugs
bnc#1027519
Xen: Missing upstream bug fixes
bnc#1052686
VUL-0: xen: grant_table: possibly premature clearing of GTF_writing / GTF_reading (XSA-230)
bnc#1051787
VUL-0: CVE-2017-12135: xen: possibly unbounded recursion in grant table code (XSA-226)
bnc#1049578
VUL-1: CVE-2017-11434: xen: slirp: out-of-bounds read while parsing dhcp options
bnc#1026236
Paravirtualized vs. fully virtualized migration - latter one much faster
bnc#1051789
VUL-0: CVE-2017-12136: xen: grant_table: Race conditions with maptrack free list handling (XSA-228)
bnc#1051788
VUL-0: CVE-2017-12137: xen: x86: PV privilege escalation via map_grant_ref (XSA-227)
bnc#1002573
Optimize LVM functions in block-dmmd
bnc#1046637
VUL-0: CVE-2017-10664: xen: qemu-nbd: server breaks with SIGPIPE upon client abort
bnc#1035231
migration of HVM domU does not use superpages on destination dom0
bnc#1055695
XEN: 11SP4 and 12SP3 HVM guests can not be restored after the save using xl stack
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