New filtering mechanism, rework command-line options

See merge request !9

Co-authored-by: Julien Muchembled <jm@nexedi.com>
9 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:22:58

passed SlapOS.Eggs.UnitTest-Master.Python3

00:14:50

passed SlapOS.Eggs.UnitTest-Master.Python2

00:16:17

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:30

passed SlapOS.Eggs.UnitTest-Master.Python2

00:26:36

passed SlapOS.Eggs.UnitTest-Master.Python3

00:16:49

passed SlapOS.Eggs.UnitTest-Master.Python3

00:19:05

passed SlapOS.Eggs.UnitTest-Master.Python3

00:27:19

passed SlapOS.Eggs.UnitTest-Master.Python3

00:27:26