cli/info,list: output in json format

because json output is different on python2 and python3 and cli is only
used on python2, we don't test the exact output in python2.
4 jobs for feat/service-info in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:13:23

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:15:27

passed SlapOS.Eggs.UnitTest-Jerome.Python2

00:11:08

passed SlapOS.Eggs.UnitTest-Jerome.Python3

00:12:44