software/kvm: Show output of the check

In case if there is a problem the output allows to understand the underlying
cause.

In case of correct run, no output is shown.
20 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

passed SlapOS.Eggs.UnitTest-Master.Python2

00:18:28

passed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.Eggs.UnitTest-Master.Python3Next

00:21:13

failed SlapOS.SoftwareReleases.IntegrationTest-Master

11:24:51

passed SlapOS.Theia.ResilienceTest-Master-ERP5

07:33:07

passed SlapOS.Theia.ResilienceTest-Master-Gitlab

14:41:29

failed Zodbtools.UnitTest-Master.ZODB6.Python3

00:00:40

passed Cloudooo.UnitTest-Master

00:08:57

passed SlapOS.Eggs.UnitTest-Master.Python2

00:22:29

passed SlapOS.Eggs.UnitTest-Master.Python3

00:17:29

passed SlapOS.Eggs.UnitTest-Master.Python3

00:15:37

passed SlapOS.Eggs.UnitTest-Master.Python3

00:31:14

passed SlapOS.Eggs.UnitTest-Master.Python3

00:16:39

passed SlapOS.Eggs.UnitTest-Master.Python3

00:17:17

passed SlapOS.Eggs.UnitTest-Master.Python3Next

00:16:55

passed SlapOS.Eggs.UnitTest-Master.Python3Next

00:15:19

passed SlapOS.Eggs.UnitTest-Master.Python3Next

00:20:46

failed SlapOS.Eggs.UnitTest-Master.Python3Next

00:26:34

failed SlapOS.SoftwareReleases.IntegrationTest-Master

07:09:31