software/matomo:use python3, change backup

See merge request !1140
4 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:06:17

passed SlapOS.Eggs.UnitTest-Master.Python2

00:21:49

passed SlapOS.Eggs.UnitTest-Master.Python3

00:14:22

passed SlapOS.SlapRunner.ResilienceTest-Master

00:22:42