standalone: invoke slapos with -v in debug mode

Some information (like the actual buildout command used to invoke buildout ) is shown only when slapos node runs with `-v`

See merge request !190
14 jobs for feat/cloudooo-ldd in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:33:16

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:44

failed SlapOS.Eggs.UnitTest-Master.Python2

00:36:18

passed SlapOS.Eggs.UnitTest-Master.Python2

00:36:18

passed SlapOS.Eggs.UnitTest-Master.Python2

00:35:24

passed SlapOS.Eggs.UnitTest-Master.Python2

00:27:21

passed SlapOS.Eggs.UnitTest-Master.Python2

00:29:25

passed SlapOS.Eggs.UnitTest-Master.Python2

00:39:42

failed SlapOS.Eggs.UnitTest-Master.Python3

00:30:40

passed SlapOS.Eggs.UnitTest-Master.Python3

00:30:27

passed SlapOS.Eggs.UnitTest-Master.Python3

00:43:28

passed SlapOS.Eggs.UnitTest-Master.Python3

00:27:31

passed SlapOS.Eggs.UnitTest-Master.Python3

00:38:34

passed SlapOS.Eggs.UnitTest-Master.Python3

00:30:06