flake8 fixes

Change-Id: I9502d16e82edd5c7b2b248e52004df7e81426889
block disable of all interfaces in Fuel Menu

Closes-Bug: #1247069

Change-Id: Ib1754d208876df80e70aac62b567c2acee2933ef
Merge "flake8 fixes" into 3.2-fixes
Merge "block disable of all interfaces in Fuel Menu" into 3.2-fixes