sync: Keep the project.list file sorted

Its easier to locate an entry visually if the file is sorted.

Signed-off-by: Shawn O. Pearce <sop@google.com>

subcmds/sync.py

@@ -166,6 +166,7 @@ uncommitted changes are present' % project.relpath
                 break
               dir = os.path.dirname(dir)
 
+    new_project_paths.sort()
     fd = open(file_path, 'w')
     try:
       fd.write('\n'.join(new_project_paths))