[BP] MB-14382 Increase the default number of ht_locks by a factor of approx. 10
[BP] MB-14382 Increase the default number of ht_locks by a factor of approx. 10

This change is backported from sherlock.

From the recent perf test results, we observed the lock contention on hash table
buckets when a hash table scanning task (i.e., expiry pager, item pager,
accecss scanner, etc.) is running.

As a long term solution, we may need to implement resizing the number of
hash table locks dynamically at runtime.

Change-Id: Ic7b9f951f58fe7190d8d0d23fb62979057e545ac
Reviewed-on: http://review.couchbase.org/48869
Reviewed-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>
Tested-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Reviewed-on: http://review.couchbase.org/55705
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

daverigby/ep-engine,membase/ep-engine,hisundar/ep-engine,teligent-ru/ep-engine,teligent-ru/ep-engine,owendCB/ep-engine,daverigby/kv_engine,membase/ep-engine,couchbase/ep-engine,daverigby/ep-engine,hisundar/ep-engine,membase/ep-engine,daverigby/kv_engine,teligent-ru/ep-engine,owendCB/ep-engine,owendCB/ep-engine,couchbase/ep-engine,hisundar/ep-engine,teligent-ru/ep-engine,couchbase/ep-engine,daverigby/kv_engine,membase/ep-engine,couchbase/ep-engine,daverigby/ep-engine,daverigby/kv_engine,daverigby/ep-engine,owendCB/ep-engine,hisundar/ep-engine