refs #8687 Minor change allowing to process legacy parameters

in dgreduce subsequently in the same script.
refs #8687 No changes, lazy push
refs #8578 Fixed unit test DgreduceTest
refs #8578 Should fix the issue
refs #8578 fixing some weird brunching error

which cause unit test to fail.
refs #8578 Trivial change allows to define hard mask file in any form

imaginable (or rather define that hard mask file is absent)
Merge remote-tracking branch 'origin/bugfix/8578_storedPythonParams'