Fix kernel-tools sub-packages for variant builds
    
    If you try rebuilding with a %variant set, you'll hit:
    
    error: line 2026: Package does not exist: %post -n kernel-tools
    
    In the %post defs, we had '%post -n kernel-tools', while the package was
    named simply '%package tools', which for the base kernel build, meant they
    worked out to the same thing, but if doing say a kernel-vanilla build, you
    had kernel-vanilla-tools and kernel-tools mismatching. This fixes the
    inconsistency.
    
    Signed-off-by: Jarod Wilson <jarod@redhat.com>