docs: def get_host_post_state(self):
          """Get the current state of system POST.
  
          Retrieves current state of system POST.
  
          :returns: POST state of the server. The valida states are:-
                    null, Unknown, Reset, PowerOff, InPost,
                    InPostDiscoveryComplete and FinishedPost.
          :raises: IloError, on an error from iLO
          """
          sushy_system = self._get_sushy_system(PROLIANT_SYSTEM_ID)
          return GET_POST_STATE_MAP.get(sushy_system.post_state)