Merge branch 'cc/upload-pack-data-2'

Further code clean-up.

* cc/upload-pack-data-2:
  upload-pack: move pack_objects_hook to upload_pack_data
  upload-pack: move allow_sideband_all to upload_pack_data
  upload-pack: move allow_ref_in_want to upload_pack_data
  upload-pack: move allow_filter to upload_pack_data
  upload-pack: move keepalive to upload_pack_data
  upload-pack: pass upload_pack_data to upload_pack_config()
  upload-pack: change multi_ack to an enum
  upload-pack: move multi_ack to upload_pack_data
  upload-pack: move filter_capability_requested to upload_pack_data
  upload-pack: move use_sideband to upload_pack_data
  upload-pack: move static vars to upload_pack_data
  upload-pack: annotate upload_pack_data fields
  upload-pack: actually use some upload_pack_data bitfields