openSUSE / agama / 9060301405

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Adapt iSCSI handling to the new architecture (#1187)

This PR implements an HTTP/JSON API for managing iSCSI devices. It works
as a proxy over the real API which is implemented in D-Bus.

The API is composed of these parts:

* A bunch of HTTP/JSON endpoints to manage the iSCSI configuration.
* A stream of iSCSI nodes changes (adding, changing or removing nodes).
* A stream of initiator changes (not implemented yet).

NOTE: this PR should be merged after #1175.

## To do

- [x] Adapt the client
- [x] Populate the cache of ISCSI nodes in the stream
- [x] Allow changing the initiator name
- [x] Allow changing the startup
- [x] Emit initiator changes
- [x] OpenAPI documentation
- [x] Remove calls to `unwrap()` in the initiator changes stream

## References

* Trello: https://trello.com/c/TEQvbxAU/

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