Always allow vbucket deletion.

Previously, we would only allow vbucket deletion for vbuckets in the
"dead" state.  This is consistent with the outward face of bucket
engine, but for our internal usage, it just makes stuff take longer.

Change-Id: If9b573434b488b009c88db926b3608ac235bbc9d

src/mc_couch_vbucket.erl

@@ -36,14 +36,9 @@ set_vbucket(VBucket, StateName, State) ->
     {reply, #mc_response{}, State}.
 
 handle_delete(VBucket, State) ->
-    case get_state(VBucket, State) of
-        <<"dead">> ->
-            DbName = mc_daemon:db_name(VBucket, State),
-            couch_server:delete(list_to_binary(DbName), []),
-            #mc_response{};
-        _ ->
-            #mc_response{status=?EINVAL, body="vbucket is not dead"}
-    end.
+    DbName = mc_daemon:db_name(VBucket, State),
+    couch_server:delete(list_to_binary(DbName), []),
+    #mc_response{}.
 
 handle_stats(Socket, Opaque, State) ->
     {ok, DBs} = couch_server:all_databases(),