Add tool to convert debug levels
    
    Older versions of SSSD (1.5 and earlier) would take a debug_level
    value set in the [sssd] section as authoritative for all other
    sections where not explicitly overridden. We changed this so that
    all sections need to set it if they want debug logs set.
    This script can be run to make the new version continue to produce
    the same logs as the old versions did, by explicitly adding
    debug_level to all domains and services that did not have it set
    already.
    
    Bugzilla https://bugzilla.redhat.com/show_bug.cgi?id=753763