puppylab: Add puppylab runtime files to .gitignore.

That's pretty much it.

BUG=None
TEST=git status

Change-Id: Ia02ba43b313285128158451939c1d1291a429c83
Reviewed-on: https://chromium-review.googlesource.com/231450
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Prashanth B <beeps@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
Trybot-Ready: Don Garrett <dgarrett@chromium.org>
diff --git a/.gitignore b/.gitignore
index fbc9ffd..42d0ae9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,8 @@
 site_utils/autotest_private/
 site_utils/autotest_tools/
 site_utils/devserver/
+
+# Pupplylab files
+puppylab/Vagrantfile
+puppylab/chromeos_lab_core_cluster.box
+puppylab/.vagrant