Removed unused TOKEN from upload_image

Changeset https://review.openstack.org/#/c/225426/ changed how images
were uploaded into Glance, however the (now) unused TOKEN variable
and function argument to upload_image remained.

These have been removed.

Change-Id: I9910c469f72d52e56111048cc24ea3c992c1d480
diff --git a/functions b/functions
index 3dae157..ff95c89 100644
--- a/functions
+++ b/functions
@@ -36,10 +36,9 @@
 # - ``FILES`` must be set to the cache dir
 # - ``GLANCE_HOSTPORT``
 #
-# upload_image image-url glance-token
+# upload_image image-url
 function upload_image {
     local image_url=$1
-    local token=$2
 
     local image image_fname image_name