Remove enableChainedItem settings from cachebench config

Summary: This is always enabled now. We don't consume this in the code.

Reviewed By: jaesoo-fb

Differential Revision: D52820068

fbshipit-source-id: c4bbaf45a8f490818e4ce7ea055c210821c1b0dd

Author: haowu14

cachelib/cachebench/test_configs/ssd_perf/flat_kvcache_reg/config.json

@@ -18,7 +18,6 @@
     "navyBlockSize": 4096,
     "navyParcelMemoryMB": 6048,
     "nvmCacheSizeMB": 932000,
-    "enableChainedItem": true,
     "htBucketPower": 27,
     "moveOnSlabRelease": true,
     "poolRebalanceIntervalSec": 2,

cachelib/cachebench/test_configs/ssd_perf/graph_cache_leader/config.json

@@ -13,7 +13,6 @@
     "navyBigHashSizePct": 65,
     "navyBlockSize": 4096,
     "navyParcelMemoryMB": 6048,
-    "enableChainedItem": true,
     "htBucketPower": 26,
     "moveOnSlabRelease": false,
     "numPools": 2,

cachelib/cachebench/test_configs/ssd_perf/kvcache_l2_reg/config.json

@@ -12,7 +12,6 @@
     "navyBigHashSizePct": 0,
     "navyBlockSize": 4096,
     "navyParcelMemoryMB": 6048,
-    "enableChainedItem": true,
     "htBucketPower": 26,
     "moveOnSlabRelease": false,
     "poolRebalanceIntervalSec": 5

cachelib/cachebench/test_configs/ssd_perf/kvcache_l2_wc/config.json

@@ -12,7 +12,6 @@
     "navyBigHashSizePct": 0,
     "navyBlockSize": 4096,
     "navyParcelMemoryMB": 6048,
-    "enableChainedItem": true,
     "htBucketPower": 26,
     "moveOnSlabRelease": true,
     "poolRebalanceIntervalSec": 2,

cachelib/cachebench/test_configs/trace_replay/block_chunk/config_block.json

@@ -6,7 +6,6 @@
     "allocFactor": 1.08,
     "maxAllocSize": 524288,
     "minAllocSize": 64,
-    "enableChainedItem": true,
     "htBucketPower": 29,
     "moveOnSlabRelease": false,
     "poolRebalanceIntervalSec": 2,
@@ -24,9 +23,9 @@
     "repeatOpCount" : true,
     "onlySetIfMiss" : false,
     "timestampFactor": 1,
-    "numOps": 2000000, 
-    "numThreads": 16, 
-    "prepopulateCache": true, 
+    "numOps": 2000000,
+    "numThreads": 16,
+    "prepopulateCache": true,
     "traceFileNames": [
 	    "block_traces_1.csv",
 	    "block_traces_2.csv"

cachelib/cachebench/test_configs/trace_replay/kvcache/config_kvtrace.json

@@ -6,7 +6,6 @@
     "allocFactor": 1.08,
     "maxAllocSize": 524288,
     "minAllocSize": 64,
-    "enableChainedItem": true,
     "htBucketPower": 29,
     "moveOnSlabRelease": false,
     "poolRebalanceIntervalSec": 2,