[nspcc-dev#1797] node/control: Verify states in SetNetmapStatus RPC…

… server

In previous implementation storage node interpreted all status values
sent in `SetNetmapStatus` RPC as `OFFLINE` except `ONLINE` and
`MAINTENANCE`. This could lead to incorrect processing of new values,
and also didn't allow detection of problems with sending garbage values.

Make implementation of `NodeState` interface used by Control API server
to deny requests with statuses other than protocol-declared enum.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/netmap.go

@@ -319,8 +319,12 @@ var errRelayBootstrap = errors.New("setting netmap status is forbidden in relay
 var errNodeMaintenance = errors.New("node is in maintenance mode")
 
 func (c *cfg) SetNetmapStatus(st control.NetmapStatus) error {
-	if st == control.NetmapStatus_MAINTENANCE {
+	switch st {
+	default:
+		return fmt.Errorf("unsupported status %d", st)
+	case control.NetmapStatus_MAINTENANCE:
 		return c.cfgObject.cfgLocalStorage.localStorage.BlockExecution(errNodeMaintenance)
+	case control.NetmapStatus_ONLINE, control.NetmapStatus_OFFLINE:
 	}
 
 	err := c.cfgObject.cfgLocalStorage.localStorage.ResumeExecution()