iotop: Update to work with python3

iotop: Update to work with python3

- v2 version has updated rootfile. One line was accidentally missed out of
   original patch submission.
- Change from building with python2 to python3
- iotop setup.py used "itervalues" which is no longer used by python3
   In python3 this has been changed to "values". Patch created to update
   this in the source tarball setup.py
- Update lfs file with patch application and use of python3
- Update of rootfile
- Installed updated version into vm testbed and iotop confirmed working

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>