patches/openwrt: add fix for obligatory reported bugs in our packages

On feeds clone the script feeds generates indexes. It is doing that right after it is cloned. That resulted in errors being reported for some of our packages depending on packages feed. The most of those packages were Python packages that were unable to be resolved thanks to including file from packages feed that at that time was missing. This just postpones index creation after all requested feeds are updated/pulled.

Upstream PR: https://github.com/openwrt/openwrt/pull/3861