This update fixes the following security and non-security issues with xtrabackup:

- update to 2.1.7 [bnc#860488]
- general changes:
* rebased on MySQL versions 5.5.35 and 5.6.15
* now uses libgcrypt randomization functions for setting the IV
[lp#1255300] [bnc#852224] CVE-2013-6394
- bugs fixed:
* After being rebased on MySQL 5.6.11 Percona XtraBackup has been
affected by the upstream bug #69780 (backward compatibility for
InnoDB recovery) [lp#1203669]
* Backup directory would need to be specified even for running the
innobackupex with --help and --version options. [lp#1223716]
- bugs fixed specific to MySQL 5.6:
* xtrabackpu did not roll back prepared XA transactions when
applying the log. [lp#1254227]