ep_testsuite: Fix incorrectly-named stats
ep_testsuite: Fix incorrectly-named stats

Fix the names of a couple of stats which were incorrect, either due to
typos or the stat being renamed.

Change-Id: Ic5bf1d2ecd01bcf4815c76d06f7128d69026d2ab
Reviewed-on: http://review.couchbase.org/49853
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

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