Fixed: FS#3564 - shell users accounts are not removed.

Till Brehm

2014-08-14 c653844975fb13bf7aaf2cc0dc96c8c70906394e

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