var: few more stability tests

 * one more dummy check added
 * when pulling hostname we might need to sleep 1 before asking again
 * change order in mac address revert
5 jobs for !844 with vb/dns_fixes in 3 minutes and 3 seconds
latest detached
Status Name Job ID Coverage
  Test
passed TestResults #13825847
manual

00:01:52

passed UnitTests #13825846

00:01:11

 
  External
failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-test-upstream/1914/

passed https://jenkins-networkmanager.apps.ocp.ci.centos.org/job/NetworkManager-test-mr/731/

00:53:37

failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-test-upstream/1914/

01:10:28