Recommended update for itstool

This update for itstool and python-libxml2-python fixes the following issues:

Package: itstool
- Updated version to support Python3. (bnc#1111019)

Package: python-libxml2-python
- Fix segfault when parsing invalid data. (bsc#1065270)

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1111019
[PYTHON2]: itstool requires /usr/bin/python
bnc#1065270
python3-libxml2-python: segfault with malformed UTF8 strings in error messages
Selected Binaries
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