add memcached sample tests using memaslap memcapable tool

Reviewed-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Signed-off-by: Shlomi Livne <shlomi@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
add redis-memonly sample tests using redis_benchmark tool

Reviewed-by: Vlad Zolotarov <vladz@cloudius-systems.com>
Signed-off-by: Shlomi Livne <shlomi@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>