Temporarily disable FIFOCompactionWithTTLTest

Summary:
FIFOCompactionWithTTLTests are flaky when run in parallel, as there is a time element involved to it. Temporarily disabling them while I investigate a more robust testing solution like, say,  mocking time.
Closes https://github.com/facebook/rocksdb/pull/2548

Differential Revision: D5386084

Pulled By: sagar0

fbshipit-source-id: 262886b25bdf091021d8553e780443a985e9bac4

db/db_test.cc

@@ -2848,7 +2848,7 @@ TEST_F(DBTest, FIFOCompactionWithTTLAndVariousTableFormatsTest) {
   ASSERT_TRUE(TryReopen(options).IsNotSupported());
 }
 
-TEST_F(DBTest, FIFOCompactionWithTTLTest) {
+TEST_F(DBTest, DISABLED_FIFOCompactionWithTTLTest) {
   Options options;
   options.compaction_style = kCompactionStyleFIFO;
   options.write_buffer_size = 10 << 10;  // 10KB