Add tar to package install

When running the "Install openshift client" task, if the target node
doesn't have tar installed the following error occurs:

```
Failed to find handler for /openshift-client-linuxpzhqp3xh.tar.gz
Make sure the required command to extract the file is installed.
Unable to find required 'gtar' or 'tar' binary in the path
```

roles/ci_setup/vars/redhat.yml

@@ -4,6 +4,7 @@ cifmw_ci_setup_packages:
   - ca-certificates
   - git-core
   - make
+  - tar
 
 cifmw_ci_setup_rhel_rhsm_default_repos:
   - 'rhel-*-baseos-rpms'