Report vhost status on vhost info

rabbitmq-management#446
[#149398495]

Author: dcorbacho

src/rabbit_vhost.erl

@@ -73,7 +73,7 @@ recover(VHost) ->
 
 %%----------------------------------------------------------------------------
 
--define(INFO_KEYS, [name, tracing]).
+-define(INFO_KEYS, [name, tracing, state]).
 
 add(VHostPath, ActingUser) ->
     rabbit_log:info("Adding vhost '~s'~n", [VHostPath]),
@@ -253,6 +253,10 @@ infos(Items, X) -> [{Item, i(Item, X)} || Item <- Items].
 
 i(name,    VHost) -> VHost;
 i(tracing, VHost) -> rabbit_trace:enabled(VHost);
+i(state,   VHost) -> case rabbit_vhost_sup_sup:is_vhost_alive(VHost) of
+                         true -> running;
+                         false -> down
+                     end;
 i(Item, _)        -> throw({bad_argument, Item}).
 
 info(VHost)        -> infos(?INFO_KEYS, VHost).