Added controllers, services, and lots of various optimizations and fixes

internal/app/wwctl/controller/add/main.go

@@ -0,0 +1,29 @@
+package add
+
+import (
+	"github.com/hpcng/warewulf/internal/pkg/node"
+	"github.com/hpcng/warewulf/internal/pkg/wwlog"
+	"github.com/spf13/cobra"
+	"os"
+)
+
+func CobraRunE(cmd *cobra.Command, args []string) error {
+
+	nodeDB, err := node.New()
+	if err != nil {
+		wwlog.Printf(wwlog.ERROR, "Failed opening node database: %s\n", err)
+		os.Exit(1)
+	}
+
+	for _, c := range args {
+		err = nodeDB.AddController(c)
+		if err != nil {
+			wwlog.Printf(wwlog.ERROR, "%s\n", err)
+			os.Exit(1)
+		}
+	}
+
+	nodeDB.Persist()
+
+	return nil
+}