adapt the openmc-update-inputs script for surfaces (#3131)

Co-authored-by: r.haddad <[email protected]>

scripts/openmc-update-inputs

@@ -1,7 +1,5 @@
 #!/usr/bin/env python3
-"""Update OpenMC's input XML files to the latest format.
-
-"""
+"""Update OpenMC's input XML files to the latest format."""
 
 import argparse
 from itertools import chain
@@ -201,6 +199,16 @@ def update_geometry(geometry_root):
 
         was_updated = True
 
+    for surface in root.findall('surface'):
+        for attribute in ['type', 'coeffs', 'boundary']:
+            if surface.find(attribute) is not None:
+                value = surface.find(attribute).text
+                surface.attrib[attribute] = value
+
+                child_element = surface.find(attribute)
+                surface.remove(child_element)
+                was_updated = True
+
     # Remove 'type' from lattice definitions.
     for lat in root.iter('lattice'):
         elem = lat.find('type')
@@ -296,4 +304,4 @@ if __name__ == '__main__':
             move(fname, fname + '.original')
 
             # Write a new geometry file.
-            tree.write(fname, xml_declaration=True)
+            tree.write(fname, xml_declaration=True)