Verify recovery correctness in multi-CF blackbox crash test (#9303)

Summary:
db_crashtest.py uses multiple CFs only when run without flag `--simple`.
The previous config set `-test_batches_snapshots=1` in that case for
blackbox mode. But `-test_batches_snapshots=1` cannot verify recovery
correctness, so it should not always be set for multi-CF blackbox tests.
We can instead randomly toggle it.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9303

Reviewed By: riversand963

Differential Revision: D33155229

Pulled By: ajkr

fbshipit-source-id: 4a6fdc4eddccc8ece664063baf6393ce1c5de6b7

tools/db_crashtest.py

@@ -99,6 +99,7 @@ default_params = {
     "subcompactions": lambda: random.randint(1, 4),
     "target_file_size_base": 2097152,
     "target_file_size_multiplier": 2,
+    "test_batches_snapshots": lambda: random.randint(0, 1),
     "top_level_index_pinning": lambda: random.randint(0, 3),
     "unpartitioned_pinning": lambda: random.randint(0, 3),
     "use_direct_reads": lambda: random.randint(0, 1),
@@ -213,7 +214,6 @@ blackbox_default_params = {
     # since we will be killing anyway, use large value for ops_per_thread
     "ops_per_thread": 100000000,
     "set_options_one_in": 10000,
-    "test_batches_snapshots": 1,
 }
 
 whitebox_default_params = {
@@ -221,7 +221,6 @@ whitebox_default_params = {
     "log2_keys_per_lock": 10,
     "ops_per_thread": 200000,
     "random_kill_odd": 888887,
-    "test_batches_snapshots": lambda: random.randint(0, 1),
 }
 
 simple_default_params = {