Add some master scripts to recipe bundle for gatekeeper

Unfortunately, these scripts are currently necessary for the
gatekeeper_ng.py script to run. I am honestly not sure if
the transitive dependencies imported by auth.py here are
going to be importable; the easiest way to tell is to submit
this CL and see if the LUCI gatekeeper builder continues to
fail or not.

Bug: 853854
Change-Id: Iad4c65cd495cf391a28ae65ea1be0baee336e1a6
Reviewed-on: https://chromium-review.googlesource.com/c/1470973
Auto-Submit: Aaron Gable <agable@chromium.org>
Commit-Queue: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
diff --git a/scripts/master/.gitattributes b/scripts/master/.gitattributes
new file mode 100644
index 0000000..2955116
--- /dev/null
+++ b/scripts/master/.gitattributes
@@ -0,0 +1,2 @@
+/__init__.py                      recipes
+/auth.py                          recipes
\ No newline at end of file