software/kvm: use sticky-compute-node instead of sticky-computer

This follows the new notation of slapos master.
10 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:11:48

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:38:06

failed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

14:48:25

passed SlapOS.Eggs.UnitTest-Master.Python2

00:18:50

passed SlapOS.Eggs.UnitTest-Master.Python3

00:15:57

passed SlapOS.Eggs.UnitTest-Master.Python3Next

00:16:40

failed SlapOS.SoftwareReleases.IntegrationTest-Master

16:22:22

passed SlapOS.Theia.ResilienceTest-Master-ERP5

12:12:09

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

11:50:36

failed Zodbtools.UnitTest-Master.ZODB6.Python3

00:00:38