ERP5: Adjust apachedex promise for haproxy

Following up !858 to
support milliseconds timings in access logs
6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:25:20

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:29:44

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

09:16:16

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

04:50:49

passed SlapOS.SlapRunner.ResilienceTest-Master

00:27:10

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:31:48