Fix flake8 issues in fuelmenu module

Registered by Dmitry Pyzhov

fuelmenu module should pass flake8 tests. We can ignore errors in welcome.py because it contains lots of long strings for output.

Blueprint information

Status:
Complete
Approver:
Dmitry Pyzhov
Priority:
High
Drafter:
None
Direction:
Approved
Assignee:
Matthew Mosesohn
Definition:
Approved
Series goal:
Accepted for 4.0.x
Implementation:
Implemented
Milestone target:
milestone icon 4.0
Started by
Dmitry Pyzhov
Completed by
Dmitry Pyzhov

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