scripts: op-mode: T3807: bugfix node.def generator

process_node() processes the XML tree in a fixed order, "node" before "tagNode"
before "leafNode". If the generator created a "node.def" file, it can no longer
be overwritten - else we would have some stale "node.def" files with an empty
help string (T2555). Without the fixed order this would resulted in a case
where we get a node and a tagNode with the same name, e.g. "show interfaces
ethernet" and "show interfaces ethernet eth0" that the node implementation
was not callable from the CLI, rendering this command useless (T3807).

This can be fixed by forcing the "node", "tagNode", "leafNode" order by sorting
the input XML file automatically (sorting from https://stackoverflow.com/a/46128043)
thus adding no additional overhead to the user.

(cherry picked from commit 7623e37c918c65418d8dfc521f976bb91f0594c0)

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