paxos: store stashed state _and_ incrementals
paxos: store stashed state _and_ incrementals

Paxos::share_state() may share a stashed state and incrementals that
follow; we need to store the same.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph