Add mapped_mget(*keys)

Change-Id: Iddaa13083730a2d533872ae1aff22c4d80d0af9e
Reviewed-on: https://gerrit.causes.com/20687
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Aiden Scandella <aiden@causes.com>
Add mapped_mset(hash)

Change-Id: Ie28a547f1bd55eb7b43ce1ded397922551899ceb
Reviewed-on: https://gerrit.causes.com/20688
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Aiden Scandella <aiden@causes.com>