Use the local APIClient rather than the one from the python-api-client

- ensures that all API calls set the request ID when talking to the API.

app/notify_client/api_key_api_client.py

@@ -1,6 +1,4 @@
-from notifications_python_client.base import BaseAPIClient
-from app.notify_client import _attach_current_user
-
+from app.notify_client import _attach_current_user, NotifyAdminAPIClient
 
 # must match key types in notifications-api/app/models.py
 KEY_TYPE_NORMAL = 'normal'
@@ -8,7 +6,7 @@ KEY_TYPE_TEAM = 'team'
 KEY_TYPE_TEST = 'test'
 
 
-class ApiKeyApiClient(BaseAPIClient):
+class ApiKeyApiClient(NotifyAdminAPIClient):
     def __init__(self):
         super().__init__("a", "b", "c")