send-pack: check ref->status before updating tracking refs

send-pack: check ref->status before updating tracking refs

Previously, we manually checked the 'NONE' and 'UPTODATE'
conditions. Now that we have ref->status, we can easily
say "only update if we pushed successfully".

This adds a test for and fixes a regression introduced in
ed31df31 where deleted refs did not have their tracking
branches removed. This was due to a bogus per-ref error test
that is superseded by the more accurate ref->status flag.

Signed-off-by: Jeff King <peff@peff.net>
Completely-Acked-By: Alex "Sleepy" Riesen <raa.lkml@gmail.com>
Acked-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>