accounts db/refactor accounts db test- make combine_ancient_slots and shrink_ancient tests to work for both append-vec and hot-storages#824

HaoranYi wants to merge 2 commits intoanza-xyz:masteranza-xyz/agave:masterfrom

HaoranYi:accounts-db/refactor_accounts_db_test6HaoranYi/solana:accounts-db/refactor_accounts_db_test6Copy head branch name to clipboard