Zero dynamic_buffer.size when it is cleared
Zero dynamic_buffer.size when it is cleared

To assist in parsing 'connections' stats, also reset dynamic_buffer.size to
zero when we reset the buffer pointer.

Change-Id: I1c336f1723d2d52ba184053d1068ad51417d0a0a
Reviewed-on: http://review.couchbase.org/40369
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Reviewed-by: Jim Walker <1cd02e31b43620d7c664e038ca42a060d61727b9@couchbase.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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