xtrabackup: update to 2.1.6

Percona XtraBackup was updated to 2.1.6 [bnc#852224]
- New Features:
* New innobackupex --force-non-empty-directories option
* now supports logs created with the new log block checksums
- New Features specific to MySQL 5.6:
option innodb_log_checksum_algorithm in Percona Server 5.6
- Bugs Fixed:
* innobackupex --copy-back fails on empty innodb_data_home_dir
* A fixed initialization vector (constant string) was used while
encrypting the data. This opened the encrypted stream/data to
plaintext attacks among others.
CVE-2013-6394
* innobackupex --version-check is now on by default.
* Since Version Check is enabled by default, new optin
--no-version-check option has been introduced to disable it.
* xtrabackup_slave_info didn't contain any GTID information, which
could cause master_auto_position not to work properly
* now supports absolute paths in innodb_data_file_path variable.
* wouldn't back up the empty directory created with mkdir
(i.e. test) outside of the server which could lead to
inconsistencies during the Percona XtraDB Cluster State Snapshot
Transfer.
* wasn't able to perform backups to the NFS mount in some NFS
configurations, because it was trying to preserve file ownership.
* unable to perform backup if innodb_log_arch_dir variable was
used in server configuration
* Race condition in start_query_killer child code could cause
parent MySQL connection to close.
- Bugs Fixed specific to MySQL 5.6:
* xtrabackup_56 was using CRC32 as the default checksum algorithm
This could cause error if the innodb_checksum_algorithm value
was changed to strict_innodb value after a restore.
* xtrabackup_56 binary didn't store the server’s
innodb_checksum_algorithm value to backup-my.cnf. This value is
needed because it affects the on-disk data format.
- update and tag percona-xtrabackup-2.1.x-nodoc.patch

Fixed bugs
bnc#852224
Percona XtraBackup 2.1.6 maintenance release
Selected Binaries
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