Bug 1392546 - Travis/Vagrant: Set innodb_flush_log_at_trx_commit=0
Bug 1392546 - Travis/Vagrant: Set innodb_flush_log_at_trx_commit=0

By default MySQL#s InnoDB flushes to disk after every transaction to
reduce the chance of data loss in the case of a crash. During testing
and development this is not necessary and only serves to limit I/O
throughput. By switching to mode `0` (flushing every second), test
runtimes are reduced by 20-30%.

See:
https://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb_flush_log_at_trx_commit

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