Added several missing my.cnf parameters

* Replaced `key_buffer` with `key_buffer_size`
* Added `slow_query_log_file` and replaced errant `slow_query_log`
  string with a boolean
* Removed extraneous `innodb_file_per_table`
* Added `sysdate_is_now`, `default_storage_engine`,
  `table_definition_cache`, `query_cache_type`, `slave_net_timeout`,
  `sync_master_info`, `sync_relay_log`, `sync_relay_log_info`, `innodb`,
  `innodb_strict_mode`