MySQL Lint fixs
MySQL Module: Small fixs and debug on _grant_to_tokens
MySQL Module: fix on grants removal
Mysql Module: centralize call to cursor execute for logs and to undo the percent escape if no args
MySQL module: some percent related fixs, mostly
MySQL module integration tests: grants tests and percent and _ tests
MySQL Module: remove use_unicode connection attribute, not needed for charset managment and would create new bugs with unicode() strings