remove LockFile

Summary: LockFile is unnecessary in unit test

Test Plan: env_basic_test.cc

Reviewers: andrewkr

Reviewed By: andrewkr

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D60285

util/env_basic_test.cc

@@ -231,15 +231,6 @@ TEST_P(EnvBasicTestWithParam, ReadWrite) {
   ASSERT_TRUE(rand_file->Read(1000, 5, &result, scratch).ok());
 }
 
-TEST_P(EnvBasicTestWithParam, Locks) {
-  FileLock* lock;
-
-  // only test they return success.
-  // TODO(andrewkr): verify functionality
-  ASSERT_OK(env_->LockFile(test_dir_ + "lock_file", &lock));
-  ASSERT_OK(env_->UnlockFile(lock));
-}
-
 TEST_P(EnvBasicTestWithParam, Misc) {
   unique_ptr<WritableFile> writable_file;
   ASSERT_OK(env_->NewWritableFile(test_dir_ + "/b", &writable_file, soptions_));

utilities/backupable/backupable_db.cc

@@ -560,7 +560,7 @@ Status BackupEngineImpl::Initialize() {
   {
     auto s = backup_env_->GetChildren(GetBackupMetaDir(), &backup_meta_files);
     if (!s.ok()) {
-      return Status::NotFound("%s not found", GetBackupMetaDir());
+      return Status::NotFound(GetBackupMetaDir() + " is missing");
     }
   }
   // create backups_ structure