Merge branch 'dt/pre-refs-backend'

Code restructuring around the "refs" area to prepare for pluggable
refs backends.

* dt/pre-refs-backend: (24 commits)
  refs: on symref reflog expire, lock symref not referrent
  refs: move resolve_ref_unsafe into common code
  show_head_ref(): check the result of resolve_ref_namespace()
  check_aliased_update(): check that dst_name is non-NULL
  checkout_paths(): remove unneeded flag variable
  cmd_merge(): remove unneeded flag variable
  fsck_head_link(): remove unneeded flag variable
  read_raw_ref(): change flags parameter to unsigned int
  files-backend: inline resolve_ref_1() into resolve_ref_unsafe()
  read_raw_ref(): manage own scratch space
  files-backend: break out ref reading
  resolve_ref_1(): eliminate local variable "bad_name"
  resolve_ref_1(): reorder code
  resolve_ref_1(): eliminate local variable
  resolve_ref_unsafe(): ensure flags is always set
  resolve_ref_unsafe(): use for loop to count up to MAXDEPTH
  resolve_missing_loose_ref(): simplify semantics
  t1430: improve test coverage of deletion of badly-named refs
  t1430: test for-each-ref in the presence of badly-named refs
  t1430: don't rely on symbolic-ref for creating broken symrefs
  ...

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