Make the post-receive hook more efficient (using pwclient info, not view)

Make the post-receive hook more efficient (using pwclient info, not view)

Older versions of patchwork shipped with a version of pwclient that
had the view command, but not info command. Now that info exists, it's
inefficient to use it to obtain the patchwork ID value, (since it
requires the server to send the entire patch content in response to an
XML RPC request).

So be kind to the server by using info instead, (which has a small,
fixed-length response).

Signed-off-by: Carl Worth <cworth@cworth.org>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>