Ignore vim swap files in autotest.py

Change-Id: Iac30106a597ade4a6a7826bf5ed9890c94a1514f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135423Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756398}

tools/autotest.py

@@ -108,7 +108,8 @@ def RecursiveMatchFilename(folder, filename):
     for entry in it:
       if (entry.is_symlink()):
         continue
-      if entry.is_file() and filename in entry.path:
+      if (entry.is_file() and filename in entry.path and
+          not os.path.basename(entry.path).startswith('.')):
         matches.append(entry.path)
       if entry.is_dir():
         # On Windows, junctions are like a symlink that python interprets as a