Improve kvstore parameterised test name
Improve kvstore parameterised test name

Adds a test name generator for the kvstore paramterised testing.
Also silences warnings introduced by the feature being added to
Google Test.

Change-Id: Ic5c2a45d57fea4f8ade5da122c9d66885c10e7be
Reviewed-on: http://review.couchbase.org/59968
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

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