buildout: add profile to test with Python 3

4 jobs for jm
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:24:07

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

05:14:39

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3