Merge branch 'tb/send-pack-no-ref-delta' into seen

'git send-pack' has been taught to refrain from sending 'REF_DELTA' encoded packfiles when the other side asks it to. * tb/send-pack-no-ref-delta: send-pack: honor `no-ref-delta` capability pack-objects: support reuse with `--no-ref-delta` pack-objects: introduce `--no-ref-delta` t/helper: teach pack-deltas to list delta entries