Quote user and password in the roundup XML-RPC URL

review1143002
(transplanted from 8d9757fd30187f3bb35287b10020dd04e320f8d6)

--HG--
extra : transplant_source : %8D%97W%FD0%18%7F%3B%B3R%87%B1%00%20%DD%04%E3%20%F8%D6