TUT: ensure tutorials run in parallel

tutorials/entrainment/0.orig/Us

tutorials/entrainment/0.orig/h

tutorials/entrainment/0.orig/hentrain

tutorials/entrainment/Allrun

tutorials/entrainment/Allrun-parallel

tutorials/entrainment/system/controlDict

tutorials/entrainment/system/decomposeParDict

tutorials/simpleslope/0.orig/Us

tutorials/simpleslope/0.orig/h

tutorials/simpleslope/0.orig/hentrain

tutorials/simpleslope/Allrun

tutorials/simpleslope/Allrun-parallel

tutorials/simpleslope/system/controlDict

tutorials/simpleslope/system/decomposeParDict