Fix valgrind failures in 3 tests in db_compaction_test due to new skiplist changes

Summary:
Several tests in db_compaction_test are failing with aborts in
valgrind. These are LevelCompactionThirdPath, LevelCompactionPathUse and
CompressLevelCompaction. We now use the SpecialSkipListFactory to make
them more deterministic

Test Plan: valgrind

Reviewers: anthony, yhchiang, kradhakrishnan, IslamAbdelRahman, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D51663

db/db_compaction_test.cc

@@ -856,6 +856,8 @@ TEST_P(DBCompactionTestWithParam, LevelCompactionThirdPath) {
   options.db_paths.emplace_back(dbname_, 500 * 1024);
   options.db_paths.emplace_back(dbname_ + "_2", 4 * 1024 * 1024);
   options.db_paths.emplace_back(dbname_ + "_3", 1024 * 1024 * 1024);
+  options.memtable_factory.reset(
+      new SpecialSkipListFactory(KNumKeysByGenerateNewFile - 1));
   options.compaction_style = kCompactionStyleLevel;
   options.write_buffer_size = 110 << 10;  // 110KB
   options.arena_block_size = 4 << 10;
@@ -971,6 +973,8 @@ TEST_P(DBCompactionTestWithParam, LevelCompactionPathUse) {
   options.db_paths.emplace_back(dbname_, 500 * 1024);
   options.db_paths.emplace_back(dbname_ + "_2", 4 * 1024 * 1024);
   options.db_paths.emplace_back(dbname_ + "_3", 1024 * 1024 * 1024);
+  options.memtable_factory.reset(
+      new SpecialSkipListFactory(KNumKeysByGenerateNewFile - 1));
   options.compaction_style = kCompactionStyleLevel;
   options.write_buffer_size = 110 << 10;  // 110KB
   options.arena_block_size = 4 << 10;
@@ -1611,6 +1615,8 @@ TEST_P(DBCompactionTestWithParam, CompressLevelCompaction) {
     return;
   }
   Options options = CurrentOptions();
+  options.memtable_factory.reset(
+      new SpecialSkipListFactory(KNumKeysByGenerateNewFile - 1));
   options.compaction_style = kCompactionStyleLevel;
   options.write_buffer_size = 110 << 10;  // 110KB
   options.arena_block_size = 4 << 10;