configure: emit errors via DC_EVENT_CONFIGURE_PROGRESS

Node test expects progress to report either success or error
eventually.

Also update the error text expected by node test.

CHANGELOG.md

@@ -10,6 +10,7 @@
 - set a default error if NDN does not provide an error
 - python: avoid exceptions when messages/contacts/chats are compared with `None`
 - node: wait for the event loop to stop before destroying contexts #3431
+- emit configuration errors via event on failure #3433
 
 ### API-Changes
 - python: added `Message.get_status_updates()`  #3416