fixed Python formatting (updated autopep8)

An update of autopep8 changed a bit the formatting of Python files.

This MR fixes the formatting.

approved this merge request

enabled an automatic merge when the pipeline for bc49fafa succeeds

• [2018-01-25 17:32] Validation started with lhcb-gaudi-merge#393

merged

mentioned in commit 16c30794

mentioned in commit f8f425d5

mentioned in merge request !589 (merged)

removed backport to v29 label

mentioned in merge request !587 (merged)

mentioned in commit d2ff12c1