Unregister image rest api call has been added.

Change-Id: I1ba1e0ca9e5a6522d268440cd7a0782b95230c4a

savanna/api/v10.py

@@ -159,6 +159,13 @@ def images_set(image_id, data):
     return _render_image(image_id, novaclient)
 
 
+@rest.delete('/images/<image_id>')
+def images_unset(image_id):
+    novaclient = nova.client()
+    novaclient.images.unset_description(image_id)
+    return u.render()
+
+
 @rest.post('/images/<image_id>/tag')
 def image_tags_add(image_id, data):
     novaclient = nova.client()

savanna/utils/openstack/images.py

@@ -49,6 +49,9 @@ class SavannaImage(images.Image):
     def set_description(self, username, description=None):
         self.manager.set_description(self, username, description)
 
+    def unset_description(self):
+        self.manager.unset_description(self)
+
     @property
     def dict(self):
         return self.to_dict()
@@ -83,6 +86,19 @@ class SavannaImageManager(images.ImageManager):
             PROP_USERNAME: username,
         })
 
+    def unset_description(self, image):
+        """Unsets all Savanna-related information.
+
+        It removes username, description and tags from the specified image.
+        """
+        image = self.get(image)
+        meta = [PROP_TAG + tag for tag in image.tags]
+        if image.description is not None:
+            meta += [PROP_DESCR]
+        if image.username is not None:
+            meta += [PROP_USERNAME]
+        self.delete_meta(image, meta)
+
     def tag(self, image, tags):
         """Adds tags to the specified image."""
         tags = _ensure_tags(tags)