Changes AASAggregatorProxy to return ConnectedAAS

- Adds test case for not existing AAS
- Rewrites AASBundleIntegrator to reflect easier API access

Change-Id: I8a42eb78216166fafecd716bb53a53139e045dbc
Signed-off-by: Frank Schnicke <frank.schnicke@iese.fraunhofer.de>
6 files changed