fixup! runTestSuite: propagate --log_directory to runUnitTest

error in the merge
3 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Master

00:15:09

failed SlapOS.Eggs.UnitTest-Master.Python3

00:19:24

failed SlapOS.Eggs.UnitTest-Master.Python3

00:17:12