Finished scenarios and minor fixes.
Merge branch 'master' of https://code.grnet.gr/git/aquarium
Fixed RabbitMQProducer init delay. RabbitMQProducer is now a service.
Custom handling of diskspace details in virtual events. NOT GOOD.
Reverted chagned to BillEntry.
Minor fix in BillEntry (Virtual Resource event have no file path).
Now astakos also publishes resource events (for addcredits)
Rename all messages
Rename conf to policy and make parentID optional (via null)
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