*: remove spaces at end of line in all python files

done with:

    find product/ bt5 -name '*.py' | xargs -n 1 sed -i 's/ *$//'
5 jobs for fix/space-end-of-line in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

00:43:47

passed ERP5.PerformanceTest-TestRunner1

00:25:46

failed ERP5.UnitTest-TestRunner1

01:25:35

failed ERP5.UnitTest-TestRunner1

01:36:23

canceled ERP5.UnitTest-TestRunner1