The implementation of "ref" API around the "packed refs" have been
cleaned up, in preparation for further changes.
* mh/packed-ref-store-prep: (25 commits)
cache_ref_iterator_begin(): avoid priming unneeded directories
ref-filter: limit traversal to prefix
create_ref_entry(): remove `check_name` option
refs_ref_iterator_begin(): handle `GIT_REF_PARANOIA`
read_packed_refs(): report unexpected fopen() failures
read_packed_refs(): do more of the work of reading packed refs
get_packed_ref_cache(): assume "packed-refs" won't change while locked
should_pack_ref(): new function, extracted from `files_pack_refs()`
ref_update_reject_duplicates(): add a sanity check
ref_update_reject_duplicates(): use `size_t` rather than `int`
ref_update_reject_duplicates(): expose function to whole refs module
ref_transaction_prepare(): new optional step for reference updates
ref_transaction_commit(): check for valid `transaction->state`
files_transaction_cleanup(): new helper function
files_ref_store: put the packed files lock directly in this struct
files-backend: move `lock` member to `files_ref_store`
lockfile: add a new method, is_lock_file_locked()
ref_store: take a `msg` parameter when deleting references
refs: use `size_t` indexes when iterating over ref transaction updates
refs_ref_iterator_begin(): don't check prefixes redundantly
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