Added ability to set calico vxlan vni and port. defaults to calico's … (#6678)

* Added ability to set calico vxlan vni and port. defaults to calico's documented defaults.

* Check if calico_network_backend is defined prior to checking value

* Removed calico hidden defaults for vxlan port and vni

* Fixed FELIX_VXLANVNI typo

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

@@ -173,6 +173,12 @@ spec:
             # Wait for the datastore.
             - name: WAIT_FOR_DATASTORE
               value: "true"
+{% endif %}
+{% if calico_network_backend is defined and calico_network_backend == 'vxlan' %}
+            - name: FELIX_VXLANVNI
+              value: "{{ calico_vxlan_vni }}"
+            - name: FELIX_VXLANPORT
+              value: "{{ calico_vxlan_port }}"
 {% endif %}
             # Choose the backend to use.
             - name: CALICO_NETWORKING_BACKEND