Ticket 50617 - disable cargo lock
    
    Bug Description: We need cargo lock for future offline builds, but
    the version of cargo in suse/rhel seems to old to support vendoring.
    
    Fix Description: For now, disable this, and rely on "online" builds
    (but we have no/few external deps anyway)
    
    https://pagure.io/389-ds-base/issue/50617
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: mhonek, mreynolds (thanks!)