test_standalone: fix TestSlapOSStandaloneLongSoftwareError

2^16 is too big and in many machines, you will have "Argument list too
long" error. Actually 2^16-1 is the limit and with the "echo "
characters in the beginning, we could do max "2^16 - 6". Using 2^15 is
already enough.
49 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS-Master.UnitTest-Master

01:51:25

failed SlapOS.Eggs.UnitTest-Master.Python2

00:24:57

failed SlapOS.Eggs.UnitTest-Master.Python3

00:26:30

passed SlapOS-Master.UnitTest-Master

01:36:49

failed SlapOS-Master.UnitTest-Master

01:27:15

failed SlapOS-Master.UnitTest-Master

01:48:24

passed SlapOS-Master.UnitTest-Master

02:09:02

passed SlapOS-Master.UnitTest-Master

01:57:04

failed SlapOS-Master.UnitTest-Master

02:36:50

failed SlapOS-Master.UnitTest-Master

02:16:33

passed SlapOS-Master.UnitTest-Master

02:16:31

passed SlapOS-Master.UnitTest-Master

12:10:58

failed SlapOS-Master.UnitTest-Master

02:19:20

failed SlapOS-Master.UnitTest-Master

03:34:43

passed SlapOS-Master.UnitTest-Master

02:37:34

passed SlapOS.Eggs.UnitTest-Master.Python2

00:25:19

failed SlapOS.Eggs.UnitTest-Master.Python2

00:26:01

passed SlapOS.Eggs.UnitTest-Master.Python2

00:27:40

failed SlapOS.Eggs.UnitTest-Master.Python2

00:23:52

passed SlapOS.Eggs.UnitTest-Master.Python2

00:35:11

passed SlapOS.Eggs.UnitTest-Master.Python2

00:27:38

passed SlapOS.Eggs.UnitTest-Master.Python2

00:26:24

passed SlapOS.Eggs.UnitTest-Master.Python2

00:26:07

failed SlapOS.Eggs.UnitTest-Master.Python2

00:24:06

passed SlapOS.Eggs.UnitTest-Master.Python2

00:24:34

failed SlapOS.Eggs.UnitTest-Master.Python2

03:52:21

passed SlapOS.Eggs.UnitTest-Master.Python2

00:24:08

passed SlapOS.Eggs.UnitTest-Master.Python2

00:29:19

failed SlapOS.Eggs.UnitTest-Master.Python2

00:23:26

failed SlapOS.Eggs.UnitTest-Master.Python2

00:23:46

failed SlapOS.Eggs.UnitTest-Master.Python2

00:25:05

failed SlapOS.Eggs.UnitTest-Master.Python3

00:25:06

failed SlapOS.Eggs.UnitTest-Master.Python3

00:25:35

passed SlapOS.Eggs.UnitTest-Master.Python3

02:45:58

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:53

passed SlapOS.Eggs.UnitTest-Master.Python3

00:24:00

passed SlapOS.Eggs.UnitTest-Master.Python3

00:23:39

passed SlapOS.Eggs.UnitTest-Master.Python3

00:24:35

failed SlapOS.Eggs.UnitTest-Master.Python3

00:28:04

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:36

passed SlapOS.Eggs.UnitTest-Master.Python3

00:26:02

failed SlapOS.Eggs.UnitTest-Master.Python3

00:25:27

passed SlapOS.Eggs.UnitTest-Master.Python3

00:28:29

failed SlapOS.Eggs.UnitTest-Master.Python3

00:26:21

failed SlapOS.Eggs.UnitTest-Master.Python3

00:24:26

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:27

failed SlapOS.Eggs.UnitTest-Master.Python3

00:28:08

failed SlapOS.Eggs.UnitTest-Master.Python3

00:29:02

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:17