move integration to kv (#1996)

cmd/headers/download/sentry_mock_test.go

cmd/integration/commands/reset_state.go

cmd/integration/commands/root.go

cmd/integration/commands/snapshot_check.go

cmd/integration/commands/stages.go

cmd/integration/commands/state_stages.go

cmd/pics/state.go

cmd/rpcdaemon/commands/get_chain_config_test.go

cmd/rpcdaemon/commands/test_util.go

cmd/snapshots/debug/debug_test.go

core/genesis.go

eth/backend.go

eth/stagedsync/headers_verify_test.go

ethdb/storage_mode.go

ethdb/storage_mode_test.go

turbo/stages/genesis_test.go