DATAJPA-624 - Fix SonarQube warnings as far as possible/reasonable.

Removed unused parameter query in Querydsl.toOrderSpecifier.
DATAJPA-624 - Fix SonarQube warnings as far as possible/reasonable.

Removed dead store in ClasspathScanningPersistenceUnitPostProessor.scanForMappingFileLocations.
DATAJPA-624 - Fix SonarQube warnings as far as possible/reasonable.

Encapsulated access to fields in EntityManagerFactoryBeanDefinition.