[COOK-2102] do not use num_cpus to determine innodb_flush_log_at_trx_commit

flush_log_at_trx_commit has valid values of:


0 - no flush to disk happens at trx commit – log buffer is flushed and sync'd to disk once per second
1 - log buffer is flushed to disk and the log file is sync'd on every trx commit
2 - log buffer is flushed to disk on each trx commit, but log file is sync'd to disk once per second

set to a default of 1 for data integrity