software/cloudooo: re-implement haproxy with a template

slapos.cookbook:haproxy no longer exist
5 jobs for 1.0
Status Job ID Name Coverage
  External
passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Stretch

passed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster