Mdbx - make it default db. Lazy buckets renaming. (#1982)

cmd/cons/commands/root.go

cmd/hack/hack.go

cmd/integration/commands/flags.go

cmd/integration/commands/root.go

cmd/rpcdaemon/cli/config.go

cmd/snapshots/generator/commands/root.go

cmd/state/commands/global_flags_vars.go

common/dbutils/bucket.go

common/dbutils/rename.go

ethdb/kv_mdbx.go

ethdb/mdbx/mdbx.go

ethdb/memory_database.go

ethdb/object_db_nomdbx.go

migrations/dupsort_state.go

migrations/dupsort_state_test.go

migrations/migrations.go

turbo/cli/flags.go

turbo/trie/flatdb_sub_trie_loader.go

turbo/trie/flatdb_sub_trie_loader_test.go