Completes https://jira.duraspace.org/browse/DPS-95: Support lazy init for mill database in durastore while preserving the ability to init database from property file.
As a note, automatic database schema creation is disabled by default now.  If you'd like to enable it, you must make sure that the following system property
is set:  hibernate.hbm2ddl.auto=[validate | update | create | create-drop].