Followup of OAK-7024 for the actual removal of the Group class from the codebase to be java 14 compliant.
Oak should compile & test on Java 14
log uses of API methods to be removed as part of OAK-7358
SimpleCredentialsSupport uses Guava API in exported API
Remove all usage of java.security.acl.Group for Java 14
bump up logging for deprecated security APIs to INFO
bump up logging for deprecated security APIs to WARN
java.security.acl deprecated in Java 10, marked for removal in Java 14