Enable H233/H301/H302 tests that are ignored at the moment

  * H233 use of print operator
  * H301 one import per line
  * H302 import only modules

Change-Id: I752c3c117e2575b30cc96d68c18df365d595588e
Closes-bug: #1263535
Merge "Enable H233/H301/H302 tests that are ignored at the moment"