Fix handling of rsync remote urls containing a username, including rsync.net.

This breakage seems to have been caused way back in 0957b771,
but I am pretty sure rsync.net support has not been entirely
broken since last April. AFAICS, the generated .ssh/config
has not changed since then -- it has never included a Username setting
line. So, I am puzzled at when this reversion was introduced.

Note that the breakage only affected checkpresent and remove. Upload and
download use the ssh connection caching, which includes a -l username.

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