provision.sh: add none authentication method for on-premise scenario

`tools/provision.sh` is provisioning SUT always in the same way for
both, the Service scenario and the on-premise scenario. While this is
not causing any issues, it does not realistically represent how we
expect osbuild-composer and worker to be used in these scenarios.

The script currently supports the following authentication options:
- `none`
  - Intended for the on-premise scenario with Weldr API.
  - NO certificates are generated.
  - NO osbuild-composer configuration file is created.
  - NO osbuild-worker configuration file is created. This means that no
    cloud provider credentials are configured directly in the worker.
  - Only the local worker is started and used.
  - Only the Weldr API socker is started.
  - Appropriate repository definitions are copied to
    `/etc/osbuild-composer/repositories/`.
- `jwt`
  - Intended for the Service scenario with Cloud API.
  - Should be the only method supported in the Service scenario in the
    future.
  - Certificates are generated and copied to `/etc/osbuild-composer`.
  - osbuild-composer configuration file is created and configured for
    JWT authentication.
  - osbuild-worker configuration file is created, configured for JWT
    authentication and with appropriate cloud provider credentials.
  - Local worker unit is masked. Only the remote worker is used (the
    socket is started and one remote-worker instance is created).
  - Only the Cloud API socket is started (Weldr API socket is stopped).
  - NO repository definitions are copied to
    `/etc/osbuild-composer/repositories/`.
- `tls`
  - Intended for the Service scenario with Cloud API.
  - Should eventually go away.
  - Certificates are generated and copied to `/etc/osbuild-composer`.
  - osbuild-composer configuration file is created and configured for
    TLS client cert authentication.
  - osbuild-worker configuration file is created, configured for TLS
    authentication and with appropriate cloud provider credentials.
  - Services and sockets are started as they used to be originally:
    - Both local and remote worker sockets are started.
    - Both Weldr and Cloud API sockets are started.
    - Only the local worker unit will be started automatically.
  - NO repository definitions are copied to
    `/etc/osbuild-composer/repositories/`.

test/cases/image_tests.sh

@@ -89,7 +89,7 @@ run_test_case () {
 }
 
 # Provision the software under test.
-/usr/libexec/osbuild-composer-test/provision.sh
+/usr/libexec/osbuild-composer-test/provision.sh none
 
 # Change to the working directory.
 cd $WORKING_DIRECTORY