MySQL config storage lock does not work
In LL::NG config storage, there is a lock feature to prevent two simultaneous storage requests to interfere.
But :
- for mysql config storage, the lock is never taken, because of a typo (dbh instead of _dbh) which is ignored since it is in an eval block
- for CDBI mysql config storage, release lock is never done
- for other DBI config storage, this lock feature is not implemented
- and lock is done in LL::NG::Common::Conf::saveConf, as same as lock checking, but unlock is done in LL::NG::Common::Conf::*::store : this seems illogical (unlock should be done in saveConf) and may result in bugs like the CDBI's one