Resolved flake8 issues #2426

Task ID: project-989/task-2426
Review ID: 413001
Migrated to 2.8 #2426

Task ID: project-989/task-2426
Review ID: 413001
Merge branch 'release/2.6.1.0' into develop
Merge branch 'feature/task-2426' of github.com:prakashpp/trytond-nereid-image-transformation into prakashpp-feature/task-2426
Release version 2.8.0.1
Merge branch 'release/2.8.0.1'