Revert "crash_test: remove the hash-based memtable from crash test (#98…

…)"

This reverts commit 21c6bd5.

tools/db_crashtest.py

@@ -310,7 +310,7 @@ def random_distribution(cuts_count):
     "experimental_mempurge_threshold": lambda: 10.0*random.random(),
     "max_background_compactions": 1,
     "max_bytes_for_level_base": 67108864,
-    "memtablerep": "skip_list",
+    "memtablerep": lambda: random.choice(["skip_list", "speedb.HashSpdRepFactory"]),
     "target_file_size_base": 16777216,
     "target_file_size_multiplier": 1,
     "test_batches_snapshots": 0,
@@ -537,8 +537,9 @@ def finalize_and_sanitize(src_params, counter):
     if dest_params.get("compression_type") != "zstd":
         dest_params["compression_zstd_max_train_bytes"] = 0
     if dest_params.get("allow_concurrent_memtable_write", 1) == 1:
-        # TODO: yuval- add hash_spd memtable
-        dest_params["memtablerep"] = "skip_list"
+        dest_params["memtablerep"] = random.choice(
+            ["skip_list", "speedb.HashSpdRepFactory"]
+        )
     if dest_params["mmap_read"] == 1:
         dest_params["use_direct_io_for_flush_and_compaction"] = 0
         dest_params["use_direct_reads"] = 0