Merge branch 'fix-issue-3943' into 'stable-3.1'

Till Brehm

2016-06-14 da8c5263302809434d43c9f385f8bac57b49d851

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ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;