BufferLog::insert: Use length_error instead of overflow_error when full
BufferLog::insert: Use length_error instead of overflow_error when full

Change-Id: Ia2904a20930a10dd0faad3050f755c7d7481db44
Reviewed-on: http://review.couchbase.org/55639
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

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