Log Message:
Update databases/percona-toolkit to 2.2.17.

v2.2.17 released 2016-03-07

* General compatibility with MySQL 5.7 tools, docs and test suite
* pt-mysql-summary displays incorrect info about Fast Server Restarts
  for Percona Server 5.6
* pt-online-schema-change cannot set sql_mode using --set-vars
* pt-online-schema-change added --null-to-non-null option to allow
  NULLable columns to be converted to NOT NULL
* pt-online-schema-change doesn't apply underscores to foreign
  keys individually
* pt-online-schema Invalid recursion method: t=dsns
* pt-online-schema-change fails when using --no-drop-old-table
  after 10 times
* pt-query-digest : Redundant argument in sprintf
* pt-query-digest doc bug with --since and too many colons
* pt-query-digest: Make documentation of --attribute-value-limit
  option more clear
* pt-show-grants fails against MySQL-5.7.6
* pt-show-grants doesn't sort column-level privileges
* pt-slave-restart fails on MariaDB 10.0.13 (gtid_mode confusion)
* pt-stalk: new var binlog_error_action causes bug in collect module
* pt-table-checksum has high likelyhood to skip a table when row count
  is around chunk-size * chunk-size-limit
* pt-table-checksum redundant argument in printf

v2.2.16 released 2015-11-09

* pt-archiver dies with "MySQL server has gone away" when
  innodb_kill_idle_transaction set to low value and bulk
  insert/delete process takes too long time
* pt-kill option --filter does not work
* pt-online-schema-change should reconnect to slaves
* pt-online-schema-change, MySQL 5.6, and InnoDB optimizer stats
  can cause downtime
* pt-stalk find -warn option is not portable
* Document that pt-table-checksum has high likelihood to skip a table
  when row count is around chunk-size * chunk-size-limit

v2.2.15 released 2015-08-28

* pt-archiver checked lag too frequently
* pt-archiver clarified function of --check-interval [DOC]
* pt-archiver now accepts checking lag on multiple slaves
* pt-archiver now checks for PXC flow control via --max-flow-ctl option
* pt-archiver options --no-delete and --purge were not mutually
  exclusive
* pt-archiver mysql timed out when innodb_kill_idle_transaction set
  to low value and check-slave-lag used
* pt-duplicate-key-checker doesn't support triple quote in column name
* pt-kill enable support for RDS
* pt-mysql-summary lacked an --ask-pass option
* pt-online-schema-change added --sleep option
* pt-online-schema-change core dump on erroneous alter directive
* pt-online-schema-change now checks for PXC flow control via
  --max-flow-ctl option
* pt-online-schema-change unstable signal handling
* pt-online-schema-change now controls constraint name length
* pt-online-schema-change --chunk-size-limit=0 inhibited checksumming
  of single nibble tables
* pt-sift failed when fetching missing tools
* pt-stalk monitors tokudb status
* pt-table-checksum doesn't reconnect to slaves when timed out
  on very long lags
* passsword parameter must escape commas - all tools [DOC]
* changes needed to build packages from git tree
* write-user-docs script stopped working after switching to github
* testing bugs related to newer perl versions