Comment 7 for bug 1589174

The last one was in fact a networking issue as well which just surfaced as this misleading:
AssertionError: isfile('/etc/cloud/templates/sources.list.debian.tmpl') call not found

The test it happens is there to check the code for networking fallback.
Yet due to no networking there was no fallback left.

It is now skipped in case it can't reach the intended fallback, looking like this:
Test rendering of a source.list from template for debian ... SKIP: Test skipped: no network connectivity to httpredir.debian.org

That way it tests nicely on all environments where it is possible but avoids issues in locked down environments.