Implement review comments for EA-1. Details below.

1. Add javadoc to OpenMRSDrugOrderMapper.
2. Use HibernateUtil.getRealObjectFromProxy instead of reflection in OrderMapper1_10.
3. Introduce OrderMetadataService to retrieve specific objects for orderfrequency and durationUnits.
4. Rename *110Test classes to *1_10
5. Remove Mock* objects and instead introduce optional items in constructors.
6. @Componentize EncounterTransactionMapper to introduce the optional constructor.
7. Fix tests.