distributed: Change `gc-save-all` to 0 by default

Fixes #1407

direct/src/distributed/ConnectionRepository.py

@@ -120,7 +120,7 @@ class ConnectionRepository(
 
         self._serverAddress = ''
 
-        if self.config.GetBool('gc-save-all', 1):
+        if self.config.GetBool('gc-save-all', 0):
             # set gc to preserve every object involved in a cycle, even ones that
             # would normally be freed automatically during garbage collect
             # allows us to find and fix these cycles, reducing or eliminating the