Adapt daf_butlerUtils to py3
Port pipe_tasks to Python 3
Port pipe_drivers to Python 3
find . -name "*.py" | xargs autopep8 --in-place
futurize -1 -w .
futurize -2 -w .
Looks to be working. Going through Jenkins now with py2 and py3.
Tim Jenness has reviewed. This has passed Jenkins with py2 and py3. Merged to master.