Pauses the hunt (removes Foreman rules, does not touch expiry time).

def Pause(self):
    """Pauses the hunt (removes Foreman rules, does not touch expiry time)."""
    if not self.IsHuntStarted():
      return

    self._RemoveForemanRule()

    self.hunt_obj.Set(self.hunt_obj.Schema.STATE("PAUSED"))
    self.hunt_obj.Flush()

    self._CreateAuditEvent("HUNT_PAUSED")