t/lru-maintainer.t: check for WARM item earlier
t/lru-maintainer.t: check for WARM item earlier

item might get pushed back out as we keep doing work. also use the move
counter instead of static number, in case of timing goofups pushing the warm
item back out.

memcached/memcached,dormando/memcached,memcached/memcached,dormando/memcached,memcached/memcached,dormando/memcached,dormando/memcached,dormando/memcached,memcached/memcached,memcached/memcached