keycloak: Turn realm_name and client_id into properties

It enables to properly override those values by getting / setting them
from / to the wrapped KeycloakOpenID instance.

swh/auth/keycloak.py

@@ -40,12 +40,25 @@ class KeycloakOpenIDConnect:
         self._keycloak = KeycloakOpenID(
             server_url=server_url, client_id=client_id, realm_name=realm_name,
         )
-
         self.server_url = server_url
-        self.realm_name = realm_name
-        self.client_id = client_id
         self.realm_public_key = realm_public_key
 
+    @property
+    def realm_name(self):
+        return self._keycloak.realm_name
+
+    @realm_name.setter
+    def realm_name(self, value):
+        self._keycloak.realm_name = value
+
+    @property
+    def client_id(self):
+        return self._keycloak.client_id
+
+    @client_id.setter
+    def client_id(self, value):
+        self._keycloak.client_id = value
+
     def well_known(self) -> Dict[str, Any]:
         """
         Retrieve the OpenID Connect Well-Known URI registry from Keycloak.

swh/auth/tests/django/test_utils.py

@@ -108,8 +108,7 @@ def test_keycloak_oidc_client_missing_django_settings():
     KEYCLOAK_REALM_NAME=REALM_NAME,
     KEYCLOAK_CLIENT_ID=CLIENT_ID,
 )
-def test_keycloak_oidc_client_parameters_from_django_settings(mocker):
-    mocker.patch("swh.auth.keycloak.KeycloakOpenID")
+def test_keycloak_oidc_client_parameters_from_django_settings():
 
     kc_oidc_client = keycloak_oidc_client()