Remove any lingering traces config

src/lager_file_backend.erl

@@ -825,7 +825,9 @@ trace_files_test_() ->
         end,
         fun(_) ->
                 catch ets:delete(lager_config),
+                application:unset_env(lager, traces),
                 application:stop(lager),
+                  
                 file:delete("events.log"),
                 file:delete("test.log"),
                 file:delete("debug.log"),

test/lager_test_backend.erl

@@ -794,6 +794,7 @@ setup() ->
     application:load(lager),
     application:set_env(lager, handlers, [{?MODULE, info}]),
     application:set_env(lager, error_logger_redirect, false),
+    application:unset_env(lager, traces),
     lager:start(),
     gen_event:call(lager_event, ?MODULE, flush).