Improve connection shutdown message when bucket is deleted
Improve connection shutdown message when bucket is deleted

Make it more explicit that this is occuring as part of bucket delete.

Change-Id: I1548a28a2a5f0db4552b6ba94928fa8d390cc938
Reviewed-on: http://review.couchbase.org/66689
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Will Gardner <cbd6f5d9092d9ef7d5c0510d53bba134b22c02f2@couchbase.com>

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