Silent wait in `prepare` task

[etj]

The prepare task may be waiting forever.

https://github.com/GeoNode/geonode-project/blob/master/src/tasks.py#L66-L72

• The geonode service in the default compose is nginx (which is always confusing and misleading)
• There's no way to override the service name
• There's no way to bypass the waiting (what if there's an external proxy?)
• There's no log telling we are waiting for something, so the process seems to be stuck
• Why a wait procedure should be run in a prepare task?