TODO - remove references to /org/piuparts/org from the stock packages.
TODO - add piuparts_slave_* as a case for sudoers.
TODO - replace known errors COMMAND with include and exclude regex's.

This supports replacing the current grep shell calls with python re
calls, for a 10-100x speed improvement in kpr creation.
TODO - make the known problems format python-friendlier.
TODO - slave_cleanup-sort mounts so that subdirs are umounted first.
TODO - remove references to ~/bin from stock packages.