This update for xtrabackup fixes the following issues:

- CVE-2016-6225: xbcrypt encryption IV not being set properly (boo#1019858)

In addition, XtraBackup was updated to 2.3.6 to include the following improvements:

- now supports SHA256 passwords
- new supports command options for secure connections

The following bugs were fixed:

- intermittent assertion failures when not correctly identifying
server version
- Safe slave backup algorithm performed too short delays between
retries which could cause backups to fail on a busy servers
- fix compilation warnings with gcc6
- Backup would still succeed even if xtrabackup would fail to
write the metadata
- xbcloud now supports EMC ECS Swift API Authorization requests
- backup failed with MariaDB 10.2 with the unsupported server
version error message