PrefixTest.PrefixAndWholeKeyTest should run against a different directory from prefix_test

Summary: PrefixTest.PrefixAndWholeKeyTest runs against the same directory as prefix_test, which sometimes fail parallel tests. Fix it.

Test Plan: Run it in parallel and see it doesn't fail anymore.

Reviewers: andrewkr

Reviewed By: andrewkr

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D56541

table/table_test.cc

@@ -2429,7 +2429,7 @@ TEST_F(PrefixTest, PrefixAndWholeKeyTest) {
 
   bbto.whole_key_filtering = true;
 
-  const std::string kDBPath = test::TmpDir() + "/prefix_test";
+  const std::string kDBPath = test::TmpDir() + "/table_prefix_test";
   options.table_factory.reset(NewBlockBasedTableFactory(bbto));
   DestroyDB(kDBPath, options);
   rocksdb::DB* db;