* add a _pagination method to base Manager
* switched existing paginated list to use the new method
* removed description from backup list and added updated
Implements: blueprint paginate-backup-list
Change-Id: If33c55a35bae8ebd6ed654af5ce6dfd7f9e40096
Reasons:
- code should be pythonicaly clean,
that is why number of ignored rules should reduced
Changes:
- E125, F811, H102, H103, F201, H23,
H302, F841, H301, H702, H703 rules are now enabled
Change-Id: Ibf4025162244d3c2f1278b49a76ec1527a729042