populate: name the target alike in all messages

What populate prints names paths on the target in different ways:
populating as host:path, also for the local target, pruning and the
errors about the sentinel by targetName, and replacing a symlink or a
Git work tree by the path alone.  All of them use targetName now: the
path, prefixed by the host if the target isn't local, and by the user if
that isn't root.  Replacing a symlink or a Git work tree quotes the path
and ends with an ellipsis, like populating and pruning do.

The tests expect the names that way, and rsync-log also expects the line
naming the source being populated.

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