Don't hardcode cycler version in software.cfg

This is a followup of 0d717989
6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:10:48

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:26

passed SlapOS.Eggs.UnitTest-Master.Python3

00:14:06

passed SlapOS.KVM.ResilienceTest-Master

00:24:45

passed SlapOS.SlapRunner.ResilienceTest-Master

00:22:38

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:15:20