Virtual host limit: error type naming

vhost_precondition_failed => vhost_limit_exceeded

vhost_limit_exceeded is the error type used by
definition import when a per-vhost is exceeded.
It feels appropriate for this case, too.

deps/rabbit/src/rabbit_vhost.erl

@@ -347,7 +347,7 @@ is_over_vhost_limit(Name, Limit) when is_integer(Limit) ->
             ErrorMsg = rabbit_misc:format("cannot create vhost '~ts': "
                                           "vhost limit '~tp' is reached",
                                           [Name, Limit]),
-            exit({vhost_precondition_failed, ErrorMsg})
+            exit({vhost_limit_exceeded, ErrorMsg})
     end.
 
 %% when definitions are loaded on boot, Username here will be ?INTERNAL_USER,

deps/rabbit/test/per_node_limit_SUITE.erl

@@ -88,11 +88,11 @@ node_connection_limit(Config) ->
 
 vhost_limit(Config) ->
     set_vhost_limit(Config, 0),
-    {'EXIT',{vhost_precondition_failed, _}} = rabbit_ct_broker_helpers:add_vhost(Config, <<"foo">>),
+    {'EXIT',{vhost_limit_exceeded, _}} = rabbit_ct_broker_helpers:add_vhost(Config, <<"foo">>),
 
     set_vhost_limit(Config, 5),
     [ok = rabbit_ct_broker_helpers:add_vhost(Config, integer_to_binary(I)) || I <- lists:seq(1,4)],
-    {'EXIT',{vhost_precondition_failed, _}} = rabbit_ct_broker_helpers:add_vhost(Config, <<"5">>),
+    {'EXIT',{vhost_limit_exceeded, _}} = rabbit_ct_broker_helpers:add_vhost(Config, <<"5">>),
     [rabbit_ct_broker_helpers:delete_vhost(Config, integer_to_binary(I)) || I <- lists:seq(1,4)],
 
     set_vhost_limit(Config, infinity),

deps/rabbitmq_cli/lib/rabbitmq/cli/ctl/commands/add_vhost_command.ex

@@ -51,7 +51,7 @@ defmodule RabbitMQ.CLI.Ctl.Commands.AddVhostCommand do
     {:error, ExitCodes.exit_usage(), "Unsupported default queue type"}
   end
 
-  def output({:badrpc, {:EXIT, {:vhost_precondition_failed, msg}}}, _opts) do
+  def output({:badrpc, {:EXIT, {:vhost_limit_exceeded, msg}}}, _opts) do
     {:error, ExitCodes.exit_usage(), msg}
   end
 

deps/rabbitmq_management/src/rabbit_mgmt_wm_vhost.erl

@@ -70,7 +70,7 @@ accept_content(ReqData0, Context = #context{user = #user{username = Username}})
               case put_vhost(Name, Description, Tags, DefaultQT, Trace, Username) of
                   ok ->
                       {true, ReqData, Context};
-                  {'EXIT', {vhost_precondition_failed,
+                  {'EXIT', {vhost_limit_exceeded,
                             Explanation}} ->
                       rabbit_mgmt_util:bad_request(list_to_binary(Explanation), ReqData, Context);
                   {error, timeout} = E ->