tests: tag OpenShift-specific tests with openshift

This is part of openshift#1445.

Those tests are all actually testing OCP components. In the new model,
they should be run against an OCP layered image instead. Add a tag on
them so that we'll be able to run them separately.

Author: jlebon

tests/kola/files/openvswitch-hugetlbfs-groups

@@ -3,6 +3,7 @@
 ##   exclusive: false
 ##   architectures: "x86_64 ppc64le"
 ##   description: Verify openvswitch user is in the hugetlbfs group.
+##   tags: openshift
 
 set -xeuo pipefail
 

tests/kola/version/rhel-matches-rhcos-build

@@ -3,6 +3,7 @@
 ##   exclusive: false
 ##   description: Verify that the OS version (C9S, RHEL 9.x) matches  
 ##     the version stored in /etc/os-release.
+##   tags: openshift
 
 set -xeuo pipefail