try to follow PEP8

- fixed most important code after checking with flake8
- ignored code which has to be reworked or removed
+ mark unused code with 'TODO: remove ...'

Change-Id: Ic45e541049e391e2853d29cd64bb0963bd9a2125
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/25053
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop/version.py

@@ -47,7 +47,7 @@ def get_git_version(abbrev=4, cwd=None):
         # mangle version to comply with pep440
         if version.count('-'):
             version, patchcount, githash = version.split('-')
-            version += '.post%s+%s' %(patchcount, githash)
+            version += '.post%s+%s' % (patchcount, githash)
         return version
     except Exception:
         return None