Multi-key setup / Security

[deajan]

We need to allow NPBackup to add other encryption keys (eg a master key for the backup operator).

Immediate action: Add CLI & GUI key management (add/list/remove), when manager permissions are set to full

As for a deployment server, we need to be able to provision new repositories with both a master key and a key that will be distributed to the local administrator / end user.
This would require a full blown deployment system, based on S3 (or else), which calls S3 API in order to create:

• A new bucket
• Two IAM policies: append for the end user, and RW for the backup administrator
• Initialize the bucket with a new repo
• Generate a config file for the end user, make it available for download manually or via API for mass deployment

[deajan]

Initial key management implemented in ac9a362 (CLI only)