test: make validate_parse more python3 friendly

Use `io.open` to open the files with the correct encoding and to allow
proper newline specification.  This allows the script to be python 2 and
python 3 compatible.

Author: compnerd

utils/incrparse/validate_parse.py

@@ -4,6 +4,7 @@
 
 import argparse
 import difflib
+import io
 import os
 import sys
 
@@ -108,8 +109,8 @@ def main():
         sys.exit(1)
 
     # Check if the two syntax trees are the same
-    lines = difflib.unified_diff(open(incremental_serialized_file).readlines(),
-                                 open(post_edit_serialized_file).readlines(),
+    lines = difflib.unified_diff(io.open(incremental_serialized_file, 'r', encoding='utf-8', errors='ignore').readlines(),
+                                 io.open(post_edit_serialized_file, 'r', encoding='utf-8', errors='ignore').readlines(),
                                  fromfile=incremental_serialized_file,
                                  tofile=post_edit_serialized_file)
     diff = '\n'.join(line for line in lines)