Merge branch 'jc/upload-corrupt'

* jc/upload-corrupt:
daemon: send stderr to /dev/null instead of closing.
upload-pack/fetch-pack: support side-band communication
Retire git-clone-pack
upload-pack: prepare for sideband message support.
upload-pack: avoid sending an incomplete pack upon failure

diff --cc Makefile
Simple merge

diff --cc daemon.c
Simple merge

diff --cc pack-objects.c
Simple merge

diff --cc pkt-line.c
Simple merge