optional calico_ip_auto_method variable with IP_AUTODETECTION_METHOD

can be set to one of
first-found
can-reach 
interface

roles/network_plugin/calico/templates/calico-node.yml.j2

@@ -108,10 +108,15 @@ spec:
                 configMapKeyRef:
                   name: calico-config
                   key: etcd_cert
+{% if calico_ip_auto_method is defined %}
+           - name: IP_AUTODETECTION_METHOD
+             value: "{{ calico_ip_auto_method }}"
+{% else %}
             - name: IP
               valueFrom:
                 fieldRef:
                   fieldPath: status.hostIP
+{% endif %}
             - name: NODENAME
               valueFrom:
                 fieldRef: