SQL: Use default_storage_engine = MyISAM for better performance and lower memory usage.

BOA already outsources all write-intensive cache* tables to Redis, will outsource also sessions in the future, disables accesslog and dblog by default, and for most typical Drupal sites MyISAM will provide better speed and much lower memory usage - typically only 1/3 of memory and binary space used by InnoDB. You can easily convert any site to-MyISAM or to-InnoDB with sqlmagic script.