remove some unncessary uses of warningIO

warningIO is not concurrent output safe, and it doesn't go to
--json-error-messages

There are a few more that would be too hard to remove, and there are also
several dozen direct prints to stderr still.

RemoteDaemon/Transport/Tor.hs

@@ -69,7 +69,7 @@ server ichan th@(TransportHandle (LocalRepo r) _) = go
 				)
 			unless ok $ do
 				hClose conn
-				warningIO "dropped Tor connection, too busy"
+				liftAnnex th $ warning "dropped Tor connection, too busy"
 	
 	handlecontrol servicerunning = do
 		msg <- atomically $ readTChan ichan