slapos_slap_tool: Fixup testSlapOSSlapTool

See merge request !499
8 jobs for feat/promise-only-cp in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

02:33:27

passed SlapOS.Eggs.UnitTest-Master.Python2

00:29:20

failed SlapOS-Master.UnitTest-Master

02:38:32

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:18

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:28

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:38

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:18

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:21