- Use sd_notify for starting agama-web-service to notify systemd
when service is ready. It helps with race condition in agama-auto
(gh#openSUSE/agama#1539)
- improve systemd dependencies of agama-web-service to ensure that
agama service runs

- For CLI, use HTTP clients instead of D-Bus clients,
for Users and Localization (gh#openSUSE/agama#1438)
- service clients used by CLI:
- added UsersHTTPClient, LocalizationHTTPClient
- removed LocalizationClient
- BaseHTTPClient API reworked:
- return () or deserialized objects
- added PUT and PATCH
- web service:
- PUT /api/users/first: do report backend errors
- PATCH /api/users/root: report the (potential) backend errors
- tests:
- added tests using httpmock
- env_logger added to dev-dependencies

- Fix `agama questions list` to list only unaswered questions and
improve its performance
(gh#openSUSE/agama#1476)

- Add dns search domains and ignore-auto-dns to network settings
(gh#openSUSE/agama#1330).

- CLI:
-- Add `agama questions list` to get list of unanswered questions