restart detach timeout together wit restarting HAF

From now autodetach, additionaly to contexts last_active_at,
considerns time of last restart of haf's hived process. This
gives applications new 4 hours to use HAF app api methods to
update contexts after HAF restart.

It fixes problem when autodetach mechanism detached contexts after
HAF and apps were stopped for longer then 4 hours, and then during
whole stack restart races between apps and autodetach may ends with
exceptions about moving detached contexts.