Low: report: Add support for xz compressed logs

Add support for reading and creating xz-compressed
log files.

Bugid: bnc#854060
Merge pull request #398 from krig/bnc854060

Low: report: Add support for xz compressed logs
Build: cts: Install cib_xml.py
Merge pull request #400 from gao-yan/install-cib_xml.py

Build: cts: Install cib_xml.py