Temporarily disable multi_cf_iter in stress test (facebook#12728)

Summary:
We plan to re-enable the test after fixing the test.

Pull Request resolved: facebook#12728

Test Plan: N/A. Disabling the test

Reviewed By: hx235

Differential Revision: D58071284

Pulled By: jaykorean

fbshipit-source-id: af6b45ec7654f9c7b40c36d3b59c7087e27a7af9

tools/db_crashtest.py

@@ -153,7 +153,7 @@
     # use_put_entity_one_in has to be the same across invocations for verification to work, hence no lambda
     "use_put_entity_one_in": random.choice([0] * 7 + [1, 5, 10]),
     "use_attribute_group": lambda: random.randint(0, 1),
-    "use_multi_cf_iterator": lambda: random.randint(0, 1),
+    "use_multi_cf_iterator": 0, # TODO(jaykorean) - re-enable this after fixing the test
     # 999 -> use Bloom API
     "bloom_before_level": lambda: random.choice([random.randint(-1, 2), random.randint(-1, 10), 0x7fffffff - 1, 0x7fffffff]),
     "value_size_mult": 32,