fix dump and load behavior to load same set of schedulers

Differential Revision: D67341003

Pull Request resolved: meta-pytorch#993

Author: lgarg26

torchx/runner/config.py

@@ -249,7 +249,16 @@ def dump(
     if schedulers:
         scheds = schedulers
     else:
-        scheds = get_scheduler_factories().keys()
+        scheduler_factories = {
+            **get_scheduler_factories(),
+            **(
+                get_scheduler_factories(
+                    group="torchx.schedulers.orchestrator", skip_defaults=True
+                )
+                or {}
+            ),
+        }
+        scheds = scheduler_factories.keys()
 
     config = _configparser()
     for sched_name in scheds: