GlusterFS: Fix uninstall regression

This reimpliments #6402 which was missed by #6918.

Signed-off-by: Jose A. Rivera <jarrpa@redhat.com>

roles/openshift_storage_glusterfs/tasks/glusterfs_uninstall.yml

@@ -49,6 +49,7 @@
     state: absent
     labels: "{{ glusterfs_nodeselector | lib_utils_oo_dict_to_list_of_dict }}"
   with_items: "{{ groups.all }}"
+  when: "'openshift' in hostvars[item]"
 
 - name: Delete pre-existing GlusterFS config
   file: