Instructions for running the current Autoware.Auto setup alongside LGSVL Simulator are now available here:
https://www.lgsvlsimulator.com/docs/autoware-auto-instructions/
For anyone working on the Autonomous Valet Parking milestone, or are just trying to connect Autoware.Auto to a simulation environment, please take a look.
Feel free to post here or reach out if you feel there are clarifications or corrections needed. Thanks!