Security update for libxml2

This update for libxml2 doesn't fix any additional security issues, but correct its rpm changelog to reflect
all CVEs that have been fixed over the past.
This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1123919
L3: The libxml2-python-2.7.6 package is missing CVE update logs
Selected Binaries
openSUSE Build Service is sponsored by