Adding datadir argument to mysqld_safe command.

This addresses an issue where MariaDB would not load databases upon first starting after a system reboot.
Adding datadir argument to mysqld_safe command.

This addresses a potential issue where MySQL may not load databases upon first starting after a system reboot. Copied from an identical fix required for MariaDB, where this behavior was first noticed.
mariadb: update 10.0.10 bottle.
mysql: update 5.6.17 bottle.