Security update for libxml2

- security update:
This update fixes the following security issues:

* CVE-2015-1819 Enforce the reader to run in constant memory [bnc#928193]
* CVE-2015-7941 Fix out of bound read with crafted xml input by stopping parsing on entities boundaries errors [bnc#951734]
* CVE-2015-7942 Fix another variation of overflow in Conditional sections [bnc#951735]
* CVE-2015-8241 Avoid extra processing of MarkupDecl when EOF [bnc#956018]
* CVE-2015-8242 Buffer overead with HTML parser in push mode [bnc#956021]
* CVE-2015-8317 Return if the encoding declaration is broken or encoding conversion failed [bnc#956260]
* CVE-2015-5312 Fix another entity expansion issue [bnc#957105]
* CVE-2015-7497 Avoid an heap buffer overflow in xmlDictComputeFastQKey [bnc#957106]
* CVE-2015-7498 Processes entities after encoding conversion failures [bnc#957107]
* CVE-2015-7499 Add xmlHaltParser() to stop the parser / Detect incoherency on GROW [bnc#957109]
* CVE-2015-8317 Multiple out-of-bound read could lead to denial of service [bnc#956260]
* CVE-2015-8035 DoS when parsing specially crafted XML document if XZ support is enabled [bnc#954429]
* CVE-2015-7500 Fix memory access error due to incorrect entities boundaries [bnc#957110]
This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#928193
VUL-1: CVE-2015-1819: libxml2: denial of service processing a crafted XML document
bnc#951734
VUL-1: CVE-2015-7941: libxml2: Crafted xml causes out of bound memory access
bnc#951735
VUL-1: CVE-2015-7942: libxml2: heap-buffer-overflow in xmlParseConditionalSections
bnc#956018
VUL-1: CVE-2015-8241: libxml2: Buffer overread with XML parser in xmlNextChar
bnc#956021
VUL-1: CVE-2015-8242: libxml2: Buffer overread with HTML parser in push mode in xmlSAX2TextNode
bnc#957105
VUL-1: CVE-2015-5312: libxml2: Another entity expansion issue
bnc#957106
VUL-1: CVE-2015-7497: libxml2: heap buffer overflow in xmlDictComputeFastQKey
bnc#957107
VUL-1: CVE-2015-7498: libxml2: processes entities after encoding conversion failures
bnc#957109
VUL-1: CVE-2015-7499: libxml2: Add xmlHaltParser() to stop the parser / Detect incoherency on GROW
bnc#956260
VUL-1: CVE-2015-8317: libxml2: Several out of bounds reads
bnc#954429
VUL-1: CVE-2015-8035: libxml2: DoS when parsing specially crafted XML document if XZ support is enabled
bnc#957110
VUL-1: CVE-2015-7500: libxml2: Fix memory access error due to incorrect entities boundaries
Selected Binaries
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