Added missing underscores in table name validation functions.

Till Brehm

2014-08-13 cd48c7ce11e4ca3b2094d6a1fd51dca3e07b6905

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