Plugin: use appropriate loggers for Debuggable helper objects
testsuite: can't disable pylint R0924, since it doesn't exist on older pylint and pylint barfs
fixed regex errors introduced by 6c996f42c53a36fc0406f836d64b8c1bec6f4bcc
Probes: fixed unit tests for new use of lxml.etree._ElementTree.write instead of open().write()