slapos_accounting: Remove test that is doing nothing

  This test seems never ever implemented since the begin of the project
6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

02:03:09

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:03

passed SlapOS.Eggs.UnitTest-Master.Python3

00:21:50

passed SlapOS-Master.UnitTest-Master

02:17:21

passed SlapOS.Eggs.UnitTest-Master.Python2

00:33:38

passed SlapOS.Eggs.UnitTest-Master.Python3

00:31:04