[#1372] adm/morph: Add delta flag to 'force-new-epoch'

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/helper/netmap.go

@@ -72,13 +72,17 @@ func InvalidConfigValueErr(key string) error {
 	return fmt.Errorf("invalid %s config value from netmap contract", key)
 }
 
-func EmitNewEpochCall(bw *io.BufBinWriter, wCtx *InitializeContext, nmHash util.Uint160) error {
+func EmitNewEpochCall(bw *io.BufBinWriter, wCtx *InitializeContext, nmHash util.Uint160, countEpoch int64) error {
+	if countEpoch <= 0 {
+		return errors.New("number of epochs cannot be less than 1")
+	}
+
 	curr, err := unwrap.Int64(wCtx.ReadOnlyInvoker.Call(nmHash, "epoch"))
 	if err != nil {
 		return errors.New("can't fetch current epoch from the netmap contract")
 	}
 
-	newEpoch := curr + 1
+	newEpoch := curr + countEpoch
 	wCtx.Command.Printf("Current epoch: %d, increase to %d.\n", curr, newEpoch)
 
 	// In NeoFS this is done via Notary contract. Here, however, we can form the