crash_test to skip compaction TTL for FIFO compaction. (#5749)

Summary:
https://github.com/facebook/rocksdb/pull/5741 added compaction TTL to crash test, but it causes assertion fails for FIFO compaction. Disable this combination for now while we debug the assertion failure.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5749

Test Plan: Run crash test and observe that when compaction_style=2, compaction_ttl is always 0.

Differential Revision: D17078292

fbshipit-source-id: 446821a3b9739956094d5e4f9be1251a15b57f5d

tools/db_crashtest.py

@@ -170,6 +170,10 @@ def finalize_and_sanitize(src_params):
         # with open_files = -1
         dest_params["compaction_ttl"] = 0
         dest_params["periodic_compaction_seconds"] = 0
+    if dest_params.get("compaction_style", 0) == 2:
+        # Disable compaction TTL in FIFO compaction, because right
+        # now assertion failures are triggered.
+        dest_params["compaction_ttl"] = 0
     return dest_params