Remove default selector from sample inventory

The `osm_default_node_selector` needs to be
`node-role.kubernetes.io/compute=true` now, but that's also the default
if it's not defined.

So let's just remove it from the sample inventory.

playbooks/openstack/sample-inventory/group_vars/OSEv3.yml

@@ -21,7 +21,6 @@ openshift_master_default_subdomain: "apps.{{ (openshift_openstack_clusterid|trim
 # domain the OpenShift cluster is configured, though.
 openshift_master_cluster_public_hostname: "console.{{ (openshift_openstack_clusterid|trim == '') | ternary(openshift_openstack_public_dns_domain, openshift_openstack_clusterid + '.' + openshift_openstack_public_dns_domain) }}"
 
-osm_default_node_selector: 'region=primary'
 
 openshift_hosted_router_wait: True
 openshift_hosted_registry_wait: True