Fix tests/bugs/caf/bug21231
Also define CSF_StandardDefaults and CSF_StandardLiteDefaults when running OCCT tests

These variables are defined in OCCT env.sh.
Reenable xml OCCT tests

Recent commits fix test hangs.
Fix CSF_CurrentUnitsDefaults and CSF_MDTVCurrentUnitsDefaults in DrawLaunchTests.cmake
Merge pull request #474 from tpaviot/review/fix-travis-occt-tests

Fix several OCCT test failures