MB-12067: Remove C++11 code from unit tests
MB-12067: Remove C++11 code from unit tests

Remove the C++11 code from the defragmenter unit tests so they will
build on pre-C++11 environments (e.g. CentOS 6).

Change-Id: I98e31eb8c9e95e82a0ce4f67dab2d1c9c2064993
Reviewed-on: http://review.couchbase.org/44108
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

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