bundle2: issue remote output as "status" (issue4612)

Remote output should be silenced by --quiet. The issue was found while running
`test-largefiles-cache.t` so it will get tested once we switch bundle2 by
default.

mercurial/bundle2.py

@@ -1171,7 +1171,7 b' def handlecheckheads(op, inpart):'
 def handleoutput(op, inpart):
     """forward output captured on the server to the client"""
     for line in inpart.read().splitlines():
-        op.ui.write(('remote: %s\n' % line))
+        op.ui.status(('remote: %s\n' % line))
 
 @parthandler('replycaps')
 def handlereplycaps(op, inpart):