Code generated from the AADL metamodel has compile errors

## Summary

Generating code from the AADL metamodel results in Java code with duplicate @Override annotations. The code generator needs to be set to Java 5 compatibility (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=547424).

Current code makes use of Java 7 and 8 features. This needs to be changed back manually.

## Environment

* **OSATE Version**: 2.6.1
* **Operating System**: all
