Merge pull request #6944 from mtnbikenc/fix-1540108

[1540108] Ignore openshift_pkg_version during 3.8 upgrade

playbooks/common/openshift-cluster/upgrades/v3_9/upgrade_control_plane.yml

@@ -64,6 +64,7 @@
 - import_playbook: ../upgrade_control_plane.yml
   vars:
     openshift_release: '3.8'
+    openshift_pkg_version: ''
   when: hostvars[groups.oo_first_master.0].openshift_currently_installed_version | version_compare('3.8','<')
 
 ## 3.8 upgrade complete we should now be able to upgrade to 3.9