Provide override for glance image size limit

The glance image size limitation was added and unfortuantely
does prevent larger images from being uploaded to glance. In the
case of all baremetal testing, this value is realistically smaller
than stock "cloud" images which support booting to baremetal with
often requisite firmware blobs, which forces some images over 1GB
in size.

Adds GLANCE_LIMIT_IMAGE_SIZE_TOTAL which allows users who need
larger images to be able to override the default while still
enabling limits enforcement in their deployment. The default
value is 1000.

Change-Id: Id425aa546f1a5973bae8be9c017782d18f0b4a47

Author: juliakreger

lib/glance

@@ -108,6 +108,10 @@ GLANCE_HOSTPORT=${GLANCE_HOSTPORT:-$GLANCE_SERVICE_HOST:$GLANCE_SERVICE_PORT}
 GLANCE_SERVICE_PROTOCOL=${GLANCE_SERVICE_PROTOCOL:-$SERVICE_PROTOCOL}
 GLANCE_UWSGI=$GLANCE_BIN_DIR/glance-wsgi-api
 GLANCE_UWSGI_CONF=$GLANCE_CONF_DIR/glance-uwsgi.ini
+
+# Glance default limit for Devstack
+GLANCE_LIMIT_IMAGE_SIZE_TOTAL=${GLANCE_LIMIT_IMAGE_SIZE_TOTAL:-1000}
+
 # If wsgi mode is uwsgi run glance under uwsgi, else default to eventlet
 # TODO(mtreinish): Remove the eventlet path here and in all the similar
 # conditionals below after the Pike release
@@ -273,11 +277,11 @@ function configure_glance_quotas {
 
     bash -c "unset OS_USERNAME OS_TENANT_NAME OS_PROJECT_NAME;
         openstack --os-cloud devstack-system-admin registered limit create \
-                --service glance --default-limit 1000 --region $REGION_NAME \
-                image_size_total; \
+                --service glance --default-limit $GLANCE_LIMIT_IMAGE_SIZE_TOTAL \
+                --region $REGION_NAME image_size_total; \
         openstack --os-cloud devstack-system-admin registered limit create \
-                --service glance --default-limit 1000 --region $REGION_NAME \
-                image_stage_total; \
+                --service glance --default-limit $GLANCE_LIMIT_IMAGE_SIZE_TOTAL \
+                --region $REGION_NAME image_stage_total; \
         openstack --os-cloud devstack-system-admin registered limit create \
                 --service glance --default-limit 100 --region $REGION_NAME \
                 image_count_total; \