logind: check PolicyKit before allowing VT switch
    
    Let's lock this down a bit. Effectively nothing much changes, since the
    default PK policy will allow users on the VT to change VT. Only users
    with no local VT session won't be able to switch VTs.
    
    (cherry picked from commit 4acf0cfd2f92edb94ad48d04f1ce6c9ab4e19d55)
    
    Resolves: #1797679
    
    patch_name: 0354-logind-check-PolicyKit-before-allowing-VT-switch.patch
    present_in_specfile: true
    location_in_specfile: 354
    squash_commits: true