clammit: reload haproxy using native feature on certificate update

instead of relying on slapos hash-file feature
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

13:28:31

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

11:13:16

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

10:46:50

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

12:31:27

failed SlapOS.SoftwareReleases.IntegrationTest-TestRunner1

08:20:47