Fix BaseFetchPackConnection's output of selected capabilities
When we output the first "have ..." line for an upload-pack server
process we need to dump "have $id $cap1 $cap2 ..", where there is
a space between the SHA-1 $id and the first capability name $cap1.
If we don't dump that space we run into errors with our own version
of upload-pack not being able to parse the SHA-1 out of the line,
as the line was split incorrectly.
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>