message: Updated LMDB environment in EE to create `data.lmdb` and lock file
diff: use std::path::Path;
  use casper_types::bytesrepr::Bytes;
  -use lmdb::{self, Database, Environment, RoTransaction, RwTransaction, WriteFlags};
  +use lmdb::{
  + self, Database, Environment, EnvironmentFlags, RoTransaction, RwTransaction, WriteFlags,
  +};
  use crate::storage::{
  error,
  @@ -71,10 +73,12 @@ impl LmdbEnvironment {
  max_readers: u32,
  ) -> Result<Self, error::Error> {
  let env = Environment::new()
  + // Set the flag to manage our own directory like in the storage component.
  + .set_flags(EnvironmentFlags::NO_SUB_DIR)
  .set_max_dbs(MAX_DBS)
  .set_map_size(map_size)
  .set_max_readers(max_readers)
  - .open(path.as_ref())?;
  + .open(&path.as_ref().join("data.lmdb"))?;
  Ok(LmdbEnvironment { env })
  }
  