Temporarily disable test CompactFilesOnLevelCompaction

Summary: https://reviews.facebook.net/D36963 made the debug build much faster and that triggered failures of CompactFilesOnLevelCompaction test. 3 out of 4 last tests on Jenkins failed. I'm disabling this test temporarily, since we likely know the reason why it's failing and there's already work in progress to address it -- https://reviews.facebook.net/D36225

Test Plan: none

Reviewers: sdong, rven, yhchiang, meyering

Reviewed By: meyering

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D36993

db/db_test.cc

@@ -9935,7 +9935,8 @@ namespace {
   }
 }  // namespace
 
-TEST_F(DBTest, CompactFilesOnLevelCompaction) {
+// TODO t6534343 -- Don't run two level 0 CompactFiles concurrently
+TEST_F(DBTest, DISABLED_CompactFilesOnLevelCompaction) {
   const int kTestKeySize = 16;
   const int kTestValueSize = 984;
   const int kEntrySize = kTestKeySize + kTestValueSize;