SpringBoot Deprecate SpringPhysicalNamingStrategy in favor of Hibernate 5.5's CamelCaseToUnderscoresNamingStrategy

When https://github.com/hibernate/hibernate-orm/pull/4098 is merged and released we should consider dropping SpringPhysicalNamingStrategy and using CamelCaseToUnderscoresNamingStrategy instead.

Comment From: wilkinsona

It's part of today's Hibernate 5.5.4 release.