runner: Invoke slapos node format instead re-implement the same thing

10 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

01:10:34

failed SlapOS.Eggs.UnitTest-Master.Python3

01:05:35

failed SlapOS.Eggs.UnitTest-Master.Python2

02:02:12

failed SlapOS.Eggs.UnitTest-Master.Python2

02:36:22

passed SlapOS.Eggs.UnitTest-Master.Python2

01:15:11

passed SlapOS.Eggs.UnitTest-Master.Python2

01:21:15

failed SlapOS.Eggs.UnitTest-Master.Python3

01:00:05

failed SlapOS.Eggs.UnitTest-Master.Python3

02:10:19

failed SlapOS.Eggs.UnitTest-Master.Python3

00:52:26

failed SlapOS.Eggs.UnitTest-Master.Python3

01:58:05