Refactor GetNode merging with new MergeNode method

- Adds many tests for node+profile merging
- Ensures that tracked fields match mergo results

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/node/methods.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"github.com/warewulf/warewulf/internal/pkg/util"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
 )
 
 type nodeList []Node
@@ -314,6 +315,23 @@ func (node *Node) Valid() bool {
 	return node.valid
 }
 
+func (node *Node) updatePrimaryNetDev() {
+	if netdev, ok := node.NetDevs[node.PrimaryNetDev]; ok {
+		netdev.primary = true
+	} else {
+		keys := make([]string, 0)
+		for k := range node.NetDevs {
+			keys = append(keys, k)
+		}
+		sort.Strings(keys)
+		if len(keys) > 0 {
+			wwlog.Debug("%s: no primary defined, sanitizing to: %s", node.id, keys[0])
+			node.NetDevs[keys[0]].primary = true
+			node.PrimaryNetDev = keys[0]
+		}
+	}
+}
+
 /*
 Check if the netdev is the primary one
 */