Parallelize db_bloom_filter_test (#5632)

Summary:
This test frequently times out under TSAN; parallelizing it should fix
this issue.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5632

Test Plan:
make check
buck test mode/dev-tsan internal_repo_rocksdb/repo:db_bloom_filter_test

Differential Revision: D16519399

Pulled By: ltamasi

fbshipit-source-id: 66e05a644d6f79c6d544255ffcf6de195d2d62fe

Makefile

@@ -442,7 +442,6 @@ TESTS = \
 	db_block_cache_test \
 	db_test \
 	db_blob_index_test \
-	db_bloom_filter_test \
 	db_iter_test \
 	db_iter_stress_test \
 	db_log_iter_test \
@@ -569,6 +568,7 @@ TESTS = \
 
 PARALLEL_TEST = \
 	backupable_db_test \
+	db_bloom_filter_test \
 	db_compaction_filter_test \
 	db_compaction_test \
 	db_merge_operator_test \

TARGETS

@@ -586,7 +586,7 @@ ROCKS_TESTS = [
     [
         "db_bloom_filter_test",
         "db/db_bloom_filter_test.cc",
-        "serial",
+        "parallel",
     ],
     [
         "db_compaction_filter_test",