[#923] adm: Move netconfig merge to a separate function

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/initialize_deploy.go

@@ -563,22 +563,9 @@ func (c *initializeContext) getContractDeployData(ctrName string, keysParam []an
 	case netmapContract:
 		md := getDefaultNetmapContractConfigMap()
 		if method == updateMethodName {
-			arr, err := c.getNetConfigFromNetmapContract()
+			if err := c.mergeNetmapConfig(md); err != nil {
-			if err != nil {
 				return nil, err
 			}
-			m, err := parseConfigFromNetmapContract(arr)
-			if err != nil {
-				return nil, err
-			}
-			for k, v := range m {
-				for _, key := range netmapConfigKeys {
-					if k == key {
-						md[k] = v
-						break
-					}
-				}
-			}
 		}
 
 		var configParam []any
@@ -618,6 +605,26 @@ func (c *initializeContext) getNetConfigFromNetmapContract() ([]stackitem.Item,
 	return arr, err
 }
 
+func (c *initializeContext) mergeNetmapConfig(md map[string]any) error {
+	arr, err := c.getNetConfigFromNetmapContract()
+	if err != nil {
+		return err
+	}
+	m, err := parseConfigFromNetmapContract(arr)
+	if err != nil {
+		return err
+	}
+	for k, v := range m {
+		for _, key := range netmapConfigKeys {
+			if k == key {
+				md[k] = v
+				break
+			}
+		}
+	}
+	return nil
+}
+
 func (c *initializeContext) getAlphabetDeployItems(i, n int) []any {
 	items := make([]any, 5)
 	items[0] = c.Contracts[netmapContract].Hash