{consistent_hash,recent_history}_exchange plugins: add retries to schema sync

So, do what RabbitMQ core does as of 3.6.7 or so.

This makes it possible for nodes with those plugins enabled to be
restarted in arbitrary order within a certain time window, just
like nodes without those plugins.

Author: michaelklishin

deps/rabbitmq_consistent_hash_exchange/src/rabbit_exchange_type_consistent_hash.erl

@@ -53,7 +53,7 @@ init() ->
                                                  {attributes, record_info(fields, chx_hash_ring)},
                                                  {type, ordered_set}]),
     mnesia:add_table_copy(?HASH_RING_STATE_TABLE, node(), ram_copies),
-    mnesia:wait_for_tables([?HASH_RING_STATE_TABLE], 30000),
+    rabbit_table:wait([?HASH_RING_STATE_TABLE]),
     recover(),
     ok.
 

deps/rabbitmq_recent_history_exchange/src/rabbit_exchange_type_recent_history.erl

@@ -127,7 +127,7 @@ setup_schema() ->
                               {record_name, cached},
                               {type, set}]),
     mnesia:add_table_copy(?RH_TABLE, node(), ram_copies),
-    mnesia:wait_for_tables([?RH_TABLE], 30000),
+    rabbit_table:wait([?RH_TABLE]),
     ok.
 
 disable_plugin() ->