Bug 1001689 - Stop suppressing the xmanager log file, r=njn

When suppressing logs (aka displaying output messages), we still need the xmanager output to go into its log file, because its port number is read out of it (yes, it's ugly.) So pipe through tee instead of redirecting to the log.

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extra : rebase_source : a4142c1d287779cc05b04988071e21415ffca445