This script is used to upload snapshots to swift and is executed on dom0 of XenServer. The PR make logging from /var/log/cloud/swiftxenserver.log more meaningful as the below example;
2017-06-15 10:26:32 DEBUG [root] #### CLOUD enter swift ####
2017-06-15 10:26:32 DEBUG [root] #### CLOUD upload begin S-12522/d841b62a-7f83-4d5d-9e9d-2940115f7fa9.vhd to swift ####
2017-06-15 10:27:13 DEBUG [root] #### CLOUD upload complete S-12522/d841b62a-7f83-4d5d-9e9d-2940115f7fa9.vhd to swift: 0:00:40 @ 45 MB/s ####
2017-06-15 10:27:13 DEBUG [root] #### CLOUD exit swift ####