Merge branch 'kn/ref-location'

Merge branch 'kn/ref-location'

Allow the directory in which reference backends store their data to
be specified.

* kn/ref-location:
  refs: add GIT_REFERENCE_BACKEND to specify reference backend
  refs: allow reference location in refstorage config
  refs: receive and use the reference storage payload
  refs: move out stub modification to generic layer
  refs: extract out `refs_create_refdir_stubs()`
  setup: don't modify repo in `create_reference_database()`