tree cf2742818fd0dba167eab1bf82e774737e945dc5
parent ef7abe193ea5b73b36f81da35add5b7e24b49669
author Carol Wang <wangkair@cn.ibm.com> 1583725883 +0800
committer Carol Wang <wangkair@cn.ibm.com> 1586922743 +0800

sched-host-tran: store/restore the value of scheduled time and
requested transition

Store/restore the value of scheduled time and requested transition, in case
BMC is rebooted. After BMC is back, go on the host transition process based
on the stored values.

Tested:
1. Get current time
 # date
   Tue Mar 10 08:16:40 UTC 2020
2. Set scheduled time 08:25:00
 # busctl set-property xyz.openbmc_project.State.ScheduledHostTransition \
   /xyz/openbmc_project/state/host0 \
   xyz.openbmc_project.State.ScheduledHostTransition ScheduledTime t 1583828700
3. Reboot BMC
4. Check sheduled time
 # busctl get-property xyz.openbmc_project.State.ScheduledHostTransition \
   /xyz/openbmc_project/state/host0 \
   xyz.openbmc_project.State.ScheduledHostTransition ScheduledTime
   t 1583828700
5. Do host transition after the scheduled time is reached.
6. Check the scheduled time again
  # busctl get-property xyz.openbmc_project.State.ScheduledHostTransition \
    /xyz/openbmc_project/state/host0 \
    xyz.openbmc_project.State.ScheduledHostTransition ScheduledTime
    t 0

Change-Id: I3bbae19a49e2fe84bf4e297e6daaa0461cbf2cb8
Signed-off-by: Carol Wang <wangkair@cn.ibm.com>