Update to SSSD 1.5.4
    
    Improve the way we detect the LDB plugin location
    
    New upstream release 1.5.4
    https://fedorahosted.org/sssd/wiki/Releases/Notes-1.5.4
    Fixes for Active Directory when not all users and groups have POSIX attributes
    Fixes for handling users and groups that have name aliases (aliases are ignored)
    Fix group memberships after initgroups in the IPA provider