readded configure hostfile command

internal/app/wwctl/configure/hostfile/root.go

@@ -0,0 +1,21 @@
+package hostfile
+
+import "github.com/spf13/cobra"
+
+var (
+	baseCmd = &cobra.Command{
+		DisableFlagsInUseLine: true,
+		Use:                   "hostfile  [OPTIONS]",
+		Short:                 "update hostfile on master",
+		Long:                  "Manage the hostfile on the master node\n",
+		RunE:                  CobraRunE,
+	}
+)
+
+func init() {
+}
+
+// GetRootCommand returns the root cobra.Command for the application.
+func GetCommand() *cobra.Command {
+	return baseCmd
+}