erp5_maileva_connector: don't enable alarm by default

8 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:37:44

passed ERP5.PerformanceTest-Master

00:25:36

failed ERP5.UnitTest-Master

01:12:14

failed ERP5.UnitTest-Master.Medusa

01:22:41

passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:53

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:44

passed SlapOS.Eggs.UnitTest-Master.Python2

00:11:18

passed SlapOS.Eggs.UnitTest-Master.Python3

00:21:06