Modified:   create_mysql_admin_user.sh

Adds support for MYSQL_PASS environment variable to utilize a preset admin password.
This allows the container to be more easily integrated into a test environment where
in which a developer may want to spin up a mysql instance with a preset password, then load
some scaffolding data all within a test harness - by allowing the password to be specified
via the docker command line, an envoking automation can set and delegate password information