We no longer use rabbit_registry for password hashing

Author: michaelklishin

src/rabbit_registry.erl

@@ -134,8 +134,7 @@ class_module(queue_decorator)     -> rabbit_queue_decorator;
 class_module(policy_validator)    -> rabbit_policy_validator;
 class_module(ha_mode)             -> rabbit_mirror_queue_mode;
 class_module(channel_interceptor) -> rabbit_channel_interceptor;
-class_module(queue_master_locator)-> rabbit_queue_master_locator;
-class_module(password_hashing_mod)-> rabbit_password_hashing.
+class_module(queue_master_locator)-> rabbit_queue_master_locator.
 
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