cli: Check pid file before random_delay

If there is another process running now, there is no need to wait, especially
without pidfile, so create such file immediately, then wait if needed.
Status Job ID Name Coverage
  External
failed SlapOS.Eggs.UnitTest-luke.Python2

00:33:37

failed SlapOS.Eggs.UnitTest-luke.Python3

00:31:11

failed SlapOS.Eggs.UnitTest-luke.Python2

01:52:55

failed SlapOS.Eggs.UnitTest-luke.Python2

01:18:24

failed SlapOS.Eggs.UnitTest-luke.Python2

00:40:42

failed SlapOS.Eggs.UnitTest-luke.Python2

00:46:56

failed SlapOS.Eggs.UnitTest-luke.Python2

00:35:09

failed SlapOS.Eggs.UnitTest-luke.Python2

00:46:47

failed SlapOS.Eggs.UnitTest-luke.Python2

00:33:10

failed SlapOS.Eggs.UnitTest-luke.Python2

00:24:16

failed SlapOS.Eggs.UnitTest-luke.Python2

00:36:41

passed SlapOS.Eggs.UnitTest-luke.Python3

02:13:27

failed SlapOS.Eggs.UnitTest-luke.Python3

00:28:24

failed SlapOS.Eggs.UnitTest-luke.Python3

01:20:04

failed SlapOS.Eggs.UnitTest-luke.Python3

00:36:33

failed SlapOS.Eggs.UnitTest-luke.Python3

00:43:30

failed SlapOS.Eggs.UnitTest-luke.Python3

00:36:22

failed SlapOS.Eggs.UnitTest-luke.Python3

00:34:19

failed SlapOS.Eggs.UnitTest-luke.Python3

00:34:03