Don't report error on cleanly closed SSL connections
Don't report error on cleanly closed SSL connections

When reading from an SSL connection, check for normal (clean)
connection close; don't report it as an error.

Change-Id: Ia4912489cafc893fa237b165be011fe13c28f711
Reviewed-on: http://review.couchbase.org/43605
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

cloudrain21/memcached-1,owendCB/memcached,couchbase/memcached,mrkwse/memcached,owendCB/memcached,daverigby/memcached,daverigby/kv_engine,daverigby/memcached,cloudrain21/memcached-1,daverigby/memcached,mrkwse/memcached,daverigby/kv_engine,cloudrain21/memcached-1,daverigby/kv_engine,couchbase/memcached,cloudrain21/memcached-1,mrkwse/memcached,daverigby/memcached,owendCB/memcached,mrkwse/memcached,daverigby/kv_engine,couchbase/memcached,couchbase/memcached,owendCB/memcached