Recursive handling for command line flags

Every struct in a NodeConf with `lopt:"foo" set is now added as a
command-line flag with the RecursiveCreateFlags call. For maps a struct
with the key UNDEF is added so that it can be parsed out.

As the flags for the command-line need variables which hold the values,
for every map an element map[UNDEF] is added.  When now calling the
internal add, these map element can be filtered out and replace by the
given name. (e.g., --netname)

* rewrote node/profile add for recursive functions
* rewrote node/profile set for recursive functions
* rewrote node/profile list for recursive functions

Signed-off-by: Christian Goll <cgoll@suse.com>

internal/app/wwctl/node/edit/main.go

@@ -45,8 +45,7 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 		wwlog.Error("Could not create temp file:%s \n", err)
 	}
 	defer os.Remove(file.Name())
-	nodeConf := node.NewConf()
-	yamlTemplate := nodeConf.UnmarshalConf([]string{"tagsdel", "default", "profiles"})
+	yamlTemplate := node.UnmarshalConf(node.NodeConf{}, []string{"tagsdel", "default", "profiles"})
 	for {
 		_ = file.Truncate(0)
 		_, _ = file.Seek(0, 0)