replayer/cli: Allow stop_after_objects to be set from configuration

It's currently not possible to declare it in the configuration file.

It's marked as already being provided (and it is with None when the flag is not used).

swh/objstorage/replayer/cli.py

@@ -203,11 +203,23 @@ def content_replay(
 
         replay.REPORTER = Redis(**replayer_cfg.get("error_reporter")).set
 
-    client = get_journal_client(
-        **journal_cfg,
-        stop_after_objects=stop_after_objects,
-        object_types=("content",),
+    # Massage the provided configuration
+    if "object_types" in journal_cfg:
+        journal_cfg.pop("object_types", None)
+
+    stop_after_objects = stop_after_objects or journal_cfg.pop(
+        "stop_after_objects", None
     )
+
+    # Fill-in the journal configuration out of the configuration and the cli
+    journal_config = {
+        **journal_cfg,
+        "stop_after_objects": stop_after_objects,
+        "object_types": ("content",),
+    }
+
+    client = get_journal_client(**journal_config)
+
     try:
         with ContentReplayer(
             src=objstorage_src_cfg,