Blacklist Calico's VXLAN interface from NetworkManager (#7037)

See https://github.com/projectcalico/calico/issues/3271

Otherwise Calico can get into a fight with NM about who "owns" the vxlan.calico
interface, breaking all pod traffic.

roles/network_plugin/calico/tasks/install.yml

@@ -24,7 +24,7 @@
   copy:
     content: |
       [keyfile]
-      unmanaged-devices=interface-name:cali*;interface-name:tunl*
+      unmanaged-devices=interface-name:cali*;interface-name:tunl*;interface-name:vxlan.calico
     dest: /etc/NetworkManager/conf.d/calico.conf
   when: nm_check.rc == 0
   notify: Calico | Reload NetworkManager