Makefile: cleanups

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
memcached.cc: Cleanups

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
LRU: Move the key to the beginning of the LRU in "get".

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>