ENH: improve harmonization class
ENH: improve harmonization class

remove superfluous super() calls
python3 compatibility
remove pydns dependency
minimal module docstring

Signed-off-by: Sebastian Wagner <1b00c120e1c33c7e19a7cb69011b74f705830cf8@sebix.at>

robcza/intelmq,sch3m4/intelmq,robcza/intelmq,pkug/intelmq,robcza/intelmq,certtools/intelmq,robcza/intelmq,certtools/intelmq,pkug/intelmq,sch3m4/intelmq,aaronkaplan/intelmq,aaronkaplan/intelmq,pkug/intelmq,certtools/intelmq,aaronkaplan/intelmq,pkug/intelmq,sch3m4/intelmq,sch3m4/intelmq