Make Calico nodename overridable on bare metal

Signed-off-by: Daniel Mohr <daniel.mohr@supercrunch.io>

roles/network_plugin/calico/defaults/main.yml

@@ -51,3 +51,5 @@ rbac_resources:
 # * interface=INTERFACE-REGEX
 # see https://docs.projectcalico.org/v3.0/reference/node/configuration#ip-autodetection-methods
 # calico_ip_auto_method: "interface=eth.*"
+
+calico_baremetal_nodename: "{{ inventory_hostname }}"

roles/network_plugin/calico/templates/cni-calico.conflist.j2

@@ -6,7 +6,7 @@
     {% if cloud_provider is defined %}
       "nodename": "{{ calico_kubelet_name.stdout }}",
     {% else %}
-      "nodename": "{{ inventory_hostname }}",
+      "nodename": "{{ calico_baremetal_nodename }}",
     {% endif %}
       "type": "calico",
       "etcd_endpoints": "{{ etcd_access_addresses }}",