JCLOUDS-457: Fix deleteContainer

The ClearVaultStrategy now ignores ResourceNotFound exceptions.

deleteContainer now tries to delete the vault first to avoid long waits.
If the delete request fails, retries it every 24 hours.
I'm not sure what the convention is in other APIs/providers, but if this is specific to Glacier, say something like `jclouds.glacier.inventory.update.time`?