Work around a bug in rsync (IMHO) introduced by openSUSE's SIP patch.

openSUSE patches rsync with a patch adding SIP protocol support.
https://gist.github.com/2026167

With this patch, running rsync with no hostname parameter is apparently
supposed to list SIP hosts on the network. Practically, it does nothing
and exits 0.

git-annex uses rsync in a very special way to allow git-annex-shell to be
run on the remote host, and so did not need to specify a hostname, or a
file to transfer as a rsync parameter. So it sent ":", a degenerate case of
"host:file".

But the patch cannot differentiate ":" with no host parameter
(a bug in the SIP patch surely).

Results were that getting files failed, as rsync seemed to succeed, but the
requested file failed to arrive. Also I think that sending files will
make git-annex think a file has been transferred to the remote when
really rsync does nothing.

The workaround for this buggy rsync patch is to use "dummy:" as the
hostname.

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