Drop removed glance-cache.conf options

These were removed when glance-registry was removed[1].

[1] 30680961994b36ed12713c0f106b661535ce41c6

Change-Id: Iaa4a35fddcd4763e12e5140b71e4022421c476fc
diff --git a/lib/glance b/lib/glance
index 5c3643d..6d6b158 100644
--- a/lib/glance
+++ b/lib/glance
@@ -446,10 +446,6 @@
     iniset $GLANCE_CACHE_CONF DEFAULT use_syslog $SYSLOG
     iniset $GLANCE_CACHE_CONF DEFAULT image_cache_dir $GLANCE_CACHE_DIR/
     iniset $GLANCE_CACHE_CONF DEFAULT image_cache_driver $GLANCE_CACHE_DRIVER
-    iniset $GLANCE_CACHE_CONF DEFAULT auth_url $KEYSTONE_SERVICE_URI
-    iniset $GLANCE_CACHE_CONF DEFAULT admin_tenant_name $SERVICE_PROJECT_NAME
-    iniset $GLANCE_CACHE_CONF DEFAULT admin_user glance
-    iniset $GLANCE_CACHE_CONF DEFAULT admin_password $SERVICE_PASSWORD
 
     # Store specific confs
     iniset $GLANCE_CACHE_CONF glance_store filesystem_store_datadir $GLANCE_IMAGE_DIR/