UBUNTU: [Packaging] annotations: Preserve single-line annotation rules

Currently, rules with notes are written out as separate lines, i. e.,
one line for the policy and one line for the note, followed by an
empty line. The parser now supports single line rules so preserve that
style when writting out the rules.

Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

debian/scripts/misc/kconfig/annotations.py

@@ -82,6 +82,7 @@ class Annotation(Config):
 
                         m = re.match(r'.* note<(.*?)>', line)
                         if m:
+                            entry['oneline'] = match
                             match = True
                             entry['note'] = "'" + m.group(1).replace("'", '') + "'"
 
@@ -284,11 +285,16 @@ class Annotation(Config):
                 if 'policy' in new_val:
                     val = dict(sorted(new_val['policy'].items()))
                     line = f"{conf : <47} policy<{val}>"
-                    tmp.write(line + "\n")
                     if 'note' in new_val:
                         val = new_val['note']
-                        line = f"{conf : <47} note<{val}>"
-                        tmp.write(line + "\n\n")
+                        if new_val.get('oneline', False):
+                            # Single line
+                            line += f' note<{val}>'
+                        else:
+                            # Separate policy and note lines,
+                            # followed by an empty line
+                            line += f'\n{conf : <47} note<{val}>\n'
+                    tmp.write(line + "\n")
 
             # Replace annotations with the updated version
             tmp.flush()