CT: No longer wait 3 minutes for node start

Reverting back to the default 1 minute. The problem with
3 minutes is that this is exceedingly long and when there
are problems the test time increases exponentially.

deps/rabbitmq_ct_helpers/src/rabbit_ct_broker_helpers.erl

@@ -741,7 +741,6 @@ do_start_rabbitmq_node(Config, NodeConfig, I) ->
       {"RABBITMQ_SERVER_START_ARGS=~ts", [StartArgs1]},
       {"RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS=+S 2 +sbwt very_short +A 24 ~ts", [AdditionalErlArgs]},
       "RABBITMQ_LOG=debug",
-      "RMQCTL_WAIT_TIMEOUT=180",
       {"TEST_TMPDIR=~ts", [PrivDir]}
       | ExtraArgs],
     Cmd = ["start-background-broker" | MakeVars],