allow secret use with usage property

Author: raspbeguy

README.md

@@ -103,7 +103,7 @@ Role Variables
           `libvirt_volume_default_device` are valid here. Default is
           `libvirt_volume_default_type`.
         - `capacity`: volume capacity, can be suffixed with k, M, G, T, P or E when type is `network` or MB,GB,TB, etc when type is `disk` (required when type is `disk` or `network`)
-        - `auth`: Authentication details should they be required. If auth is required, `name`, `type`, `token` will need to be supplied.
+        - `auth`: Authentication details should they be required. If auth is required, `name`, `type`, and `token` or `usage` will need to be supplied. `token` and `usage` should not be both supplied.
         - `source`: Where the remote volume comes from when type is `network`. `protocol`, `name`, `hostname` and `port` should be supplied.
         - `format`: Format of the volume. All options for
           `libvirt_volume_default_format` are valid here. Default is

templates/vm.xml.j2

@@ -43,7 +43,7 @@
       {% elif volume.type is defined and volume.type == 'network' %}
         {% if volume.auth.name is defined %}
         <auth username='{{ volume.auth.name }}'>
-          <secret type='{{ volume.auth.type }}' uuid='{{ volume.auth.token }}'/>
+          <secret type='{{ volume.auth.type }}' {% if volume.auth.token is defined and volume.auth.token is not none %} uuid='{{ volume.auth.token }}' {% else %} usage='{{ volume.auth.usage }}' {% endif %}/>
         </auth>
         {% endif %} {# End volume.auth.name check #}
         {% if volume.source.name is defined %}