Merge branch 'kn/fetch-push-bulk-ref-update' into kn/fetch-push-bulk-ref-update-fixup

* kn/fetch-push-bulk-ref-update:
  receive-pack: use batched reference updates
  send-pack: fix memory leak around duplicate refs
  fetch: use batched reference updates
  refs: add function to translate errors to strings

diff --cc builtin/fetch.c
Simple merge

diff --cc builtin/receive-pack.c
Simple merge