cache_req: Correction of cache_req debug string ID format
    
    The cache-req debug string representation uses a wrong format
    specifier for by-ID requests.
    data->id (uint32_t) should be replaced with  %"PRIu32"
    in cache_req_group_by_id.c, cache_req_object_by_id.c &
    cache_req_user_by_id.c.
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/3570
    
    Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>