Fix valgrind errors introduced by https://reviews.facebook.net/D10863

Summary:
The valgrind errors were in the unit tests where we change the
number of levels of a database using internal methods.

Test Plan:
valgrind ./reduce_levels_test
valgrind ./db_test

Reviewers: emayanke

Reviewed By: emayanke

CC: leveldb

Differential Revision: https://reviews.facebook.net/D10893

db/db_test.cc

@@ -591,6 +591,7 @@ TEST(DBTest, LevelLimitReopen) {
   }
 
   options.num_levels = 1;
+  options.max_bytes_for_level_multiplier_additional.resize(1, 1);
   Status s = TryReopen(&options);
   ASSERT_EQ(s.IsCorruption(), true);
   ASSERT_EQ(s.ToString(),
@@ -598,6 +599,7 @@ TEST(DBTest, LevelLimitReopen) {
             "more levels than options.num_levels");
 
   options.num_levels = 10;
+  options.max_bytes_for_level_multiplier_additional.resize(10, 1);
   ASSERT_OK(TryReopen(&options));
 }
 

util/ldb_cmd.cc

@@ -681,6 +681,7 @@ void ReduceDBLevelsCommand::Help(string& ret) {
 Options ReduceDBLevelsCommand::PrepareOptionsForOpenDB() {
   Options opt = LDBCommand::PrepareOptionsForOpenDB();
   opt.num_levels = old_levels_;
+  opt.max_bytes_for_level_multiplier_additional.resize(opt.num_levels, 1);
   // Disable size compaction
   opt.max_bytes_for_level_base = 1UL << 50;
   opt.max_bytes_for_level_multiplier = 1;