Flake8: Fix H302

Fix H302 and enable the test:
H302  import only modules.'from X import Y' does not import a module

Fix also in the touched files the following:
E128 continuation line under-indented for visual indent

Change-Id: I3116c030a5dc0b5be2b4413beaa460e483215774
Partial-Bug: #1333290
Merge "Flake8: Fix H302"