prune: add support for new name of signature files

10 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS-Master.UnitTest-Master

04:48:03

passed SlapOS.Eggs.UnitTest-Master.Python2

00:42:25

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:20

failed SlapOS-Master.UnitTest-Master

01:59:59

failed SlapOS.Eggs.UnitTest-Master.Python2

failed SlapOS.Eggs.UnitTest-Master.Python2

00:59:18

passed SlapOS.Eggs.UnitTest-Master.Python2

01:23:13

passed SlapOS.Eggs.UnitTest-Master.Python2

01:05:18

passed SlapOS.Eggs.UnitTest-Master.Python3

01:55:24

passed SlapOS.Eggs.UnitTest-Master.Python3

01:08:25