add missing gettextutils imports

Several files use the "_" function, but don't import it from
gettextutils - this leads to a "NameError: name '_' is not
defined" error if you try to import/use the modules from an
interactive python shell or standalone test-code.

Change-Id: Id28b45d71eeda64fbfaa6234b12cff45fcd2ce40
Merge "add missing gettextutils imports"