state_diff/get_diff(): return the interfaces sorted by their indices

Author: daniloegea

netplan_cli/cli/state_diff.py

@@ -102,6 +102,8 @@ def get_diff(self, interface: str = '') -> dict:
 
             report['interfaces'].update(iface)
 
+        # Sort the list of interfaces according to their indices.
+        report['interfaces'] = dict(sorted(report['interfaces'].items(), key=lambda iface: iface[1].get('index')))
         return report
 
     def _create_new_report(self) -> dict: