Wrong ':aws_volume_id' when creating snapshots

[mfojtik]

How to reproduce:

1. Create 2 volumes
2. Use the second one as a parameter for :try_create_snapshot method

The resulting snapshot will have :aws_volume_id property set to the ID of
first volume instead of the volume used for creation.

I'll check how hard is to fix this, if someone want to beat me he is very welcome to ;-)