Update api.py

Fixes authentication bug. Aligns with https://github.com/cwrc/islandora_bagger/blob/14661df7867af47bb86187f0f94a067e5aa91fd2/src/Service/IslandoraBagger.php#L270-L272

rootfs/var/www/leaf-isle-bagger/drupal/api.py

@@ -11,15 +11,15 @@
 def init_session(args, username, password):
 
     session = requests.Session()
-    session.auth = (username, password)
-
-    # auth_endpoint = 'user/login?_format=json'
-    # response = session.post(
-    #    urljoin(args.server, auth_endpoint),
-    #    json={'email': username, 'pass': password},
-    #    headers={'Content-Type': 'application/json'}
-    # )
-    # response.raise_for_status()
+    #session.auth = (username, password)
+
+    auth_endpoint = 'user/login?_format=json'
+    response = session.post(
+      urljoin(args.server, auth_endpoint),
+      json={"name": username, 'pass': password},
+      headers={'Content-Type': 'application/json'}
+    )
+    response.raise_for_status()
 
     return session