Add cinder-tmp to c-vol (#1330)

When using other backends like purestorage and users wants to create volume that are not raw, we need to have cinder-tmp dir inside the c-vol container to be able to perform the image copy and conversion.

Reviewed-by: Mohammed Naser <mnaser@vexxhost.com>
Reviewed-by: Giovanni Tirloni
Reviewed-by: Guilherme Steinmüller <gsteinmuller@vexxhost.com>
diff --git a/roles/cinder/vars/main.yml b/roles/cinder/vars/main.yml
index eee67ed..dc9aa4d 100644
--- a/roles/cinder/vars/main.yml
+++ b/roles/cinder/vars/main.yml
@@ -20,6 +20,15 @@
     replicas:
       api: 3
       scheduler: 3
+    mounts:
+      cinder_volume:
+        cinder_volume:
+          volumeMounts:
+            - name: cinder-tmp
+              mountPath: /var/lib/cinder/tmp
+          volumes:
+            - name: cinder-tmp
+              emptyDir: {}
   conf:
     policy: {}
     cinder: