Now that openSUSE_Tumbleweed has backing of the openSUSE project OBS should be
cleaned up to make sure that Tumbleweed users never have the need to add a
openSUSE_Factory repository to their machines that isn't actually meant to be
added to a Tumbleweed system.

Adding an openSUSE_Factory repository should never be suggested for anyone that
uses Tumbleweed - it's too hard to tell if this is correct or not (one needs to
read and understand the Meta xml of the repo config to figure out if that
openSUSE_Factory refers to standard or snapshot).

I believe this should be done at least to all repos outside of the home:
namespace to save every repository maintainers to do this manually.

The patching should also remove a openSUSE_Factory target if a Tumbleweed one
already exists and the Factory one refers to snapshot to avoid wasting build
cycles.

Currently using Tumbleweed is a bit annoying as lots of repos aren't available
for it yet and one has to use Factory repos for those.

Example: https://build.opensuse.org/project/show/server:php:extensions

Even worse are repos where the maintainers are ignorant or unwilling to do the
renaming / adding of the Tumbleweed repo:
https://build.opensuse.org/project/show/devel:tools:building

please solve this on the project level

thanks in advance