Add additional Random.atfork() to prevent RNG errors in large runs

ssh/transport.py

@@ -1505,6 +1505,10 @@ class Transport (threading.Thread):
         # indefinitely, creating a GC cycle and not letting Transport ever be
         # GC'd. it's a bug in Thread.)
 
+        # Required to prevent RNG errors when running inside many subprocess
+        # containers.
+        Random.atfork()
+
         # active=True occurs before the thread is launched, to avoid a race
         _active_threads.append(self)
         if self.server_mode: