gs_fetch_binpkg: Add retries to the Copy.

Increase retries to 10 in the script itself, up from the default 3.

BUG=b:197574857
TEST=cq

Change-Id: Ie26e2147074ca05852c4648ccb1110c45708bd9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3200193
Tested-by: Alex Klein <saklein@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Alex Klein <saklein@chromium.org>
diff --git a/scripts/gs_fetch_binpkg.py b/scripts/gs_fetch_binpkg.py
index ed3266f..8b6fcbb 100644
--- a/scripts/gs_fetch_binpkg.py
+++ b/scripts/gs_fetch_binpkg.py
@@ -37,7 +37,7 @@
   temp_path = '%s.tmp' % filename
   osutils.SafeUnlink(temp_path)
   try:
-    ctx.Copy(uri, temp_path)
+    ctx.Copy(uri, temp_path, retries=10)
     shutil.move(temp_path, filename)
   finally:
     osutils.SafeUnlink(temp_path)